If you want the best activated carbon air cleaner for your home, there are only four on the current market worthy of consideration: Allerair, Austin Air, BlueAir, and IQAir.

Each of these companies understands that a large quantity of activated carbon is essential for proper gas and odor control performance. You will not find any others that include the same level of activated carbon or make available specially impregnated blends to ensure best performance.

The best online vendor for air purifiers is AllergyBuyersClub.com. They also understand air purification fully and do not represent any products that are inferior or questionable in any way. This is really the first principal of customer service – To sell only what will meet the customers expectations.

To learn more about activated carbon for air purification view these additional articles:

• Why is activated carbon filtration essential in your air purifier?
• Choosing activated carbon filters | How to evaluate air purifier quality
• The activated carbon filter pad in multistage air purifiers isnt good enough
• Activated carbon for odor control in your home

Activated carbon air cleaners by IQAir

IQAir is a new entrant into the home air purifier market place from Switzerland. The company is in the hospital clean room business.

Iqair’s Healthpro Plus covers up to 900 sq. ft. and features a gas filter element with 6 lbs of activated carbon to reduce odors and gases. Each air filter can be changed independently. All the filters stack up modular fashion and can be changed in about 3 minutes without tools. You should replace the activated carbon filter every 10-21 months. IQAir guarantees this air purifier in the United States for 5 years. Filters are, as consumables, exempt from this warranty.

IQAir’s Gas Control Series air filters have 11 to 13 pounds of activated carbon. There are four models: The IQAir GC Multigas Air Purifier, IQAir GC Chemisorber Air Purifier, IQAir GC VOC Air Purifier, and IQAir GC AM Air Purifier. The IQAir GC Series air purifier models each contain four gas filter cartridges that provide a specific type of gas, chemical, or VOC control. All of the IQAir air purifiers for gas control have controls for monitoring each filter’s useful life. Filters need to be changed every 12 to 30 months. No tools are required to change filters. IQAir guarantees these air purifiers in normal household use for 1 year in the United States. Filters are, as consumables, exempt from this warranty.

Activated carbon air cleaners by Allerair

Allerair provides you with the best air purification on a cost for performance basis. Due to his wife’s multiple chemical sensitivities, Sam Teitelbaum and his partner Wayne Martin decided to develop their own air purifier. That effort resulted in their founding Allerair with a commitment to provide the most effective and cost efficient air purification available.

What sets Allerair apart is it’s founder’s personal experience with poor air quality affecting his family’s health; it’s commitment to innovation and quality; it’s specialized knowledge of indoor air quality issues; it’s goal to design and offer safe, high quality and well priced air cleaning equipment. From reducing a child’s allergy symptoms to containing infectious disease to large-scale disaster restoration, Allerair is the best air purifier manufacturer for cost effective air purification.

Allerair has developed well over one hundred air purifier models, more than any other air purifier manufacturer in the world. Combined with over forty different specialized blends of activated carbon, Allerair is equipped to provide you with any air cleaning solution imaginable.

Allerair’s residential activated carbon air cleaners offer activated carbon filters with four to forty-eight pounds of activated carbon. They are typically designed for large areas up to 1800 sq. ft. or whole house use. Activated carbon filter life is as long as 3 years. All filters are easy to change without tools. There is even the option of replacing the carbon in bulk as opposed to a filter cartridge. All units are simple and no nonsense in design and operation. They come with a five year warranty.

Activated carbon air cleaners by Blueair

Blueair is a Swedish company that manufactures air purifiers combining ionizer, electrostatic, activated carbon and HEPA filter technologies. Even with the ionizer and electrostatic components their purifiers emit no external ozone. They are noted for their very quiet operation.

The Blueair air purifiers are available with HEPASilent particle filters or HEPASilent/Carbon filters that are a combined HEPA and activated carbon filter for smoke, odor, gas and VOC control. They utilize 5.3 pounds of activated carbon impregnated with several chemisorbers for improved purification. Filter replacement is recommended every six months and is very easy to do. The activated carbon air cleaners by Blueair are effective for areas up to 679 sq. ft. They carry a 10-year warranty on all models except the Blueair 201 that has 5 years.

Activated carbon air cleaners by Austin Air

Austin Air manufactures good economy priced HEPA air purifiers that also provide VOC, gas and odor removal. Austin Air air purifiers concentrate on the essentials of air cleaning and are not loaded with fancy features.

Austin Air’s air purifiers use activated carbon-zeolite air filters weighing from 6.5 to 15 pounds. Zeolite is a naturally occurring mineral that has gas adsorption properties similar to activated carbon and is often used in economy air purifiers.

The Plus models include impregnation with potassium iodide enabling these air purifiers to better remove volatile organic chemicals and chemically reactive gases such as ammonia, bleaching solutions, ethylene, formaldehyde and paint smells. All filters are rated to last five years.

Austin Air also offers a unique air purification technology they call HEGA, for High Efficiency Gas Adsorption. HEGA combines the gas trapping ability of military activated carbon cloth for smoke, smog and fumes from city environments with HEPA particle filtration. This military activated carbon cloth is lightweight and used to protect military personnel from toxic poisons.

Austin Air air purifiers cover 350 to 1500 sq. ft. Austin air purifiers replacement filter costs are low, which means less annual maintenance cost. Austin Air offers a 5-year prorated warranty for normal home use and includes a permanent pre-filter you can vacuum clean.

What You Need To Do

Discover which home air purifiers give the performance you need.

Together, we’ll compare these five types of air purifiers:

1. Filter Based Air Purifiers
2. HEPA Air Purifiers
3. Ionic Air Purifiers

1. Gas and Odor Air Purifiers
2. Ozone Air Purifiers

Understanding these air purifier technologies permits you to reject poor performers so you can focus on the right air purifier for you.

I’ll show you how…

Are you confused by too many home air purifier choices?

It’s good to have a choice, but not if you’re unable to choose confidently.

I know this frustration well. I face MCS, allergy and asthma daily in my family. Finding the right home air purifier was an absolute necessity.

I proved to myself that HEPA air purifiers were best for my personal needs. If you also contend with mild to severe breathing problems, I believe you’ll find a HEPA air purifier helps you the most.

You’ll discover why by comparing the different types of home air purifiers.

Let’s Compare Home Air Purifiers

Filter Based Air Purifiers – Use Caution

Filter based home air purifiers may use simple foam or fiber pads, pleated paper or even HEPA filter media.

Because a fan forces air through them, these air purifiers have the small drawback of noise. However, they can clean large amounts of air quickly.

Unfortunately, while they may clean large amounts of air they may not clean to the standard you desire. Why is this true?

Because efficiency is often no greater than 50%. Most manufacturers do not reveal filter efficiencies. Home air purifiers using unverified filters may be completely unable to collect the particles that concern you. Even larger particles like pollen may not be removed effectively.

Short filter replacement schedules are also common. One of the greatest scams in the market is to sell a cheap air purifier and then bilk the customer later with high priced replacement filters.

HEPA Filter Air Purifiers – Verified, Guaranteed Performance

Only HEPA air filters meet a verifiable performance standard. HEPA filters must remove 99.97% of particles 0.3 micron in size.

A common misconception is that HEPA filters perform less well with smaller particles. In reality, HEPA efficiency is higher with smaller particle sizes.

This may seem to defy logic, but what many are unaware of is a law of particle motion called Brownian diffusion. This effect prevents particles smaller than 0.3 micron from escaping the HEPA filter. This enables removal not only of allergens and irritants but even many bacteria and viruses.

Because HEPA filters are superior many manufacturers try to boost your confidence in their products by advertising so-called HEPA Type filters. These often fall far short of the HEPA standard, so use caution when considering home air purifiers that don’t use true HEPA filters.

The cost of replacement HEPA filters may seem high compared to other filters. However, replacement may be once every two to five years. Thus the actual cost for exceptionally clean air is low by comparison.

HEPA air purifiers provide the best filtration of large volumes of air.

Ionic Air Purifiers – Not Recommended

Ionic air purifiers use electric charges to remove allergens and irritants. They have no effect on gases and odors.

With collector plates collection efficiency tends to be no greater than 80%. Studies show efficiency reduces to as little as 20% in as few as three days because of plate loading.

Without collector plates charged particles may cling to any surface. This is called “black wall effect”. The EPA warns these charged particles may deposit in the lungs. This makes such air cleaners a possible health threat.

Regular cleaning of collector plates is a must for continued performance. Many owners complain it is difficult cleaning closely spaced collectors.

These types of air purifiers are often praised for being silent. With little air being moved and thus cleaned you might ask for whom is this silence golden, you or the marketers pushing the idea of a silent air purifier?

Ionic air purifiers produce ozone which is lung damaging and elevates sensitivity to allergens and irritants. Never expose asthmatic persons to it.

Gas and Odor Air Purifiers – Good Additional Protection

Gas phase filters remove odors and chemicals but not particles.

The most effective gas filtration technology is activated carbon. It removes up to 60% of its own weight in chemicals.

A deep bed of activated carbon is best. That is why high quality air purifiers include many pounds of activated carbon.

Thin activated carbon pads are practically worthless. They cannot supply the “dwell time” needed for pollutants to remain in contact with the carbon. Without sufficient dwell time few pollutants are removed.

Rather than a competing technology, gas filtration is considered complementary to HEPA air purification. Combined with HEPA air filters it creates the most effective home air purifiers available.

Ozone Air Purifiers – Reject Completely

Proponents of ozone air purifiers claim ozone oxidizes pollutants, reducing them to water and carbon dioxide. In the real world such textbook reactions rarely happen. Instead, numerous byproducts are created.

These byproducts can be more dangerous than the original pollutants.

Ozone cannot distinguish what is and is not a pollutant. It reacts with almost anything it contacts, degrading materials and creating additional pollutants.

Supporters claim ozone kills bacteria but deny it kills cells in your airway. They reject all scientific evidence and warnings that ozone is harmful.

Sellers of ozone air purifiers are perpetrating a fraud. They get away with it in the US because no agency has authority to regulate these products.

An ozone air purifier is ineffective and exposes you to danger.

Conclusions About Home Air Purifiers

Choosing an air purifier is a serious undertaking. Please take the time to carefully research the right home air purifier for your needs.

I highly recommend these five air purifier manufacturers in particular:

• Austin Air
• Allerair
• BlueAir
• IQAir
• NQ Clarifier

Now that you know more about the types of air purifiers, does HEPA seem to offer you the performance you need for real health benefits? I’d like to invite you to explore our next step – Why the best air purifier demands HEPA filtration.

Are you one of many office workers considering your own personal office air purifier as a means to combat office air pollution and resulting health problems?

Is your office air at stale and irritating? Do you experience an increase in your allergy symptoms or nasal and eye irritation, even drowsiness and mental fog? You may be a victim of Sick Building Syndrome.

Would you like to know more about office air quality? EPA document on office air quality OSHA and US Dept. of Labor site about office air quality Please share this site about air purifiers

Sick Building Syndrome, a term first used in the 1970s, continues to affect office workers now as much as ever. Due to tighter buildings and a failure to recognize the importance of office building indoor air quality, health problems among office workers are on the rise.

While modern building codes require buildings to supply adequate clean air, in actual practice these are often circumvented. Office air intake may be limited to reduce power consumption, but this reduces the available fresh air. Air handling systems may be turned off at night or on weekends to save money, allowing office air pollution to build up.

Activities within the building such as cleaning, the use of aerosols and so-called air fresheners, perfumes and other personal care products, as well as office equipment and building materials can contribute an office air pollution load greater than ventilation systems can remove.

Is there anything you can do to improve your office indoor air quality? While better source control and ventilation would go a long way toward improving office building indoor air quality, you personally may not have any control over these issues. (For a list of seventeen suggestions to reduce office air pollution see Control Measures That Help Office Air Purification at bottom of the page).

One option you may wish to consider is investing in your own personal office air purifier.

One of the most important factors in keeping your office a healthy and pleasant place to work is indoor air free of health robbing contaminants. An office air purifier can help to remove those contaminants.

If you are experiencing irritation of the eyes, skin, nose and throat, mental fatigue, headaches, a stuffy nose, and other flu-like symptoms on a regular basis at work then poor air quality is probably to blame. Good quality air is air that can be breathed continuously without suffering these health effects.

Choosing the best office air purifier to provide this continuous supply of good quality air requires that you understand the pollutants you face and which of air purifier technology best removes them.

Requirements of an Office Air Cleaner

While respirable particles under 10 microns are always a matter of concern, the typical office workers health is affected most by two other contaminant sources.

These are biological (fungi, molds, bacteria, viruses, and allergens like pollen and cat dander brought in from outdoor sources) and chemical pollutants (fumes from cleaning products, furniture, carpets, paint, solvents, office supplies and equipment, personal products of workers, and manufacturing activities in adjoining areas). Both types of pollutants have the ability to irritate tissues and cause allergic reactions or infections.

Biological contaminants respond best to source control, however an office air purifier can help to reduce them. Since biological contaminants are particulate in nature, any air purifier chosen to control them must be able to deal effectively with extremely small particles.

This is best achieved with a HEPA media based office air cleaner.

Why Reject an Ionic Office Air Cleaner?

Though popular and heavily advertised, ionic style electrostatic precipitators should not be considered due to their many disadvantages.

These include low collection efficiency and rapid reduction in collection efficiency as the plates load with particles. In as few as three days, ionic cleaners can be reduced to less than 20% collection efficiency with the most significant reduction occurring with the smallest particle sizes, the very ones you wish to control.

Another big disadvantage is ozone production. Ozone is itself an irritant and lung-damaging chemical with the added effect of increasing sensitivities to other allergens and irritants.

Finally, ionic air purifiers have no effect on chemical pollutants at all, making them unsuitable to control some of the most significant health threats in your office air. If you want a truly effective office air purifier you should remove ionic type air cleaners from consideration.

Why is a HEPA Office Air Cleaner a Better Choice?

A HEPA media based office air purifier will remove 99.97% of particles as small as 0.3 micron. This is adequate for pollens, most dander, fungus, mold spores, and some of the largest bacteria.

A HEPA filter will also demonstrate some collection efficiency in particle sizes below 0.3 micron and thus trap smaller bacteria and even viruses. However, without tested ratings in these smaller particles it isnt possible to know the effectiveness any given air purifier may demonstrate.

A superior testing method does exist and is used to determine HEPA efficiencies in these smallest of particles. It is known as EN1822 (A European filter performance standard). It tests an air purifiers effectiveness at 0.16 micron, known as the Most Penetrating Particle Size (MPPS for short) and below. At this level of purification, bacteria and viruses are much more effectively removed.

The first manufacturer to meet this standard for a home and office air purifier was IQAir. The Allerair AirMedic also meets the standard of an EN1822 certified filter, removing 99% of particles as small as 0.01 micron and so being effective against bacteria and viruses.

Other air purifiers are available that sterilize bacteria, viruses and molds by exposing them to ultraviolet light as they pass through the HEPA filter. This either kills them or renders them unable to reproduce and thus cause infection.

Your best office air purifier will be a true medical grade HEPA based air cleaner. Adding a UV sterilizing option is very desirable as well as adequate activated carbon chemical control as discussed next.

An Office Air Purifier for Chemical Control

Every office has a variety of chemical contaminants, which can accumulate to high levels and affect your health.

Carbon monoxide from vehicle exhaust can be sucked into air intakes and circulated to all parts of the building. Photocopiers and other electrical equipment can produce ozone. Walls, carpets and furniture can emit volatile organic compounds such as formaldehyde. Perfumes and personal care products can expose office occupants to numerous chemicals. In an effort to improve stale and poor smelling air, aerosol air fresheners and other fragrances may be used that simply mask the problem while adding their own chemical load to the air. Photocopier toner or cigarette ash particles can become airborne and inhaled.

An office air purifier must be able to remove this broad range of office air pollution.

The only effective means of removing a wide variety of chemicals is through the use of activated carbon. This requires more than the token few ounces that are found in the carbon impregnated pads used in many air purifiers.

Activated carbon can adsorb up to 60% of its weight in airborne chemicals. To do this, sufficient dwell time, or the time the air spends in contact with the carbon, must be provided. This is achieved only in those air purifiers that use many pounds of activated carbon. Thus the ideal office air purifier will be one that contains a large block of activated carbon in addition to a HEPA filter.

Office air purifiers that meet the above criteria and which you may wish to consider are IQAir, Allerair, Austin Air, and Blueair. Each has models that offer excellent HEPA grade filtration, pounds of activated carbon and UV sterilizer options.

Would you like to know more about the purifiers I consider to be among the best office air cleaners?

Control Measures That Help Office Air Purification

In addition to investing in an office air purifier you may wish to consider the following control measures:

• Be aware of the symptoms of SBS, such as a persistent cough or headache.
• Find out how your building’s ventilation system works. Where are the office air intakes located? re they near an outside source of pollution?
• If your staff is experiencing symptoms of poor office air quality, check to see if there are any sources of contamination to the building’s ventilation system. Volatile chemicals, automobile exhaust from parking lots, or cigarette smoke can be picked up by the air intakes and circulated throughout the building.
• If your office adjoins a manufacturing area, be aware of contaminants from that source.
• Make sure the building’s ventilation system is cleaned regularly and kept in proper working order even if you aren’t experiencing any obvious problems – you may find that it will improve productivity and well being.
• Don’t turn off the ventilation system at night or on weekends. The additional cost is small compared to the lowered productivity and increased absenteeism caused by poor indoor air quality.
• Take the ventilation system design into account when making room for new employees or rearranging the office. Adding heat-generating equipment, such as photocopiers, may also affect air quality. The ventilation system may need to be modified to incorporate the changes.
• Don’t block air intakes or diffusers with furniture or other equipment that will prevent air circulation. Workstations should not be placed close to an air diffuser.
• Keep office temperature in the low to mid-70s F. Relative humidity should not exceed 60 to 70 per cent.
• Eliminate air contaminants at the source.
• Keep lids on containers of solvents or use non-solvent based products.
• Employees who smoke should do so outdoors away from entrances.
• Photocopiers should be in a separate room, and ideally vented to the outdoors.
• Disinfect dehumidifier trays regularly to prevent mold growth.
• Choose plants such as cacti that like dry soil conditions. Potted plants, while touted to improve indoor air quality, do not remove much in the way of pollution. They do add to the biological pollution due to mold and fungi growth in the soil they are planted in.
• Consider having your office air quality tested by a professional ventilation engineer or an industrial hygienist.
• When planning a move to another floor or building, talk to other people who have worked there. Have there been any problems with air quality?

When asked why I feel Allerair air purifiers provide some of the best air cleaners available I have to ask back “Who would you trust to provide you with clean, healthy air? A mega budget marketing company that jumped on the air quality bandwagon in pursuit of the almighty dollar? Or an air purifier manufacturer that has invested almost twenty years solving air quality problems throughout the world?”

They have developed over one hundred air purifier models, more than any other air purifier manufacturer in the world. Combined with over forty different specialized blends of activated carbon, Allerair is equipped to provide customers who have allergies or multiple chemical sensitivities with the best performance air purifier at the most reasonable price.

What sets this company apart is it’s founder’s personal experience with poor air quality and poor air cleaner choices. Failing to find any air purifier on the market that could address his wife’s multiple chemical sensitivities, Sam Teitelbaum and his partner Wayne Martin developed their own air purifier. That effort resulted in their founding Allerair with a commitment to provide effective and cost efficient air purification.

Allerair air purifiers, fume extractors, industrial, commercial and medical air cleaners are used by prominent companies and organizations including MIT, IBM, the U.S Military, the Mayo Clinic, Duke University Medical Center, Boeing, Lockheed Martin and the NASA Ames Research Center. They are trusted by countless contractors and many thousands of loyal clients who suffer from respiratory distress.

Why Allerair air purifiers are superior to so-called “market leaders”

The last few years has seen substantial growth in sales of air purifiers. This is due to growing awareness of indoor air quality problems and resulting bad health effects. Unfortunately, this has caused a rush to market by innumerable marketers whose primary business has never been air purification. The result has been an explosion of so-called air purifiers of dubious quality. The end user has been the poorer for it – both financially and health wise.

When it comes to air purification, there are three main points you should consider before buying an air purifier. These are: “Is it safe?”, “Is it effective?”, and “Is it at reasonable cost?”

Are Allerair air purifiers safe?

Certain types of air purifier technologies and components used in air purification can be detrimental to your health, actually releasing toxic gases into the air. While it seems hard to believe that an air purifier would add pollutants to the air, some air purifiers will help by removing particles while poisoning you with the release of toxic gases.

Below you will find some of the most common health hazards found in air purifiers. Most companies do not go to great lengths to ensure their air cleaners’ safety.

Ozone is not used by Allerair

Some air purifiers use ozone to remove chemicals from the air. Ozone acts by attaching one oxygen atom to other chemicals, forming the normal oxygen that we breathe and a by-product. Manufacturers of these products claim that this changes the chemical structure of the molecule and will neutralize it. This is only partly true. Ozone will irritate the lungs, nose, throat, and eyes. There are indications that there may be negative effects from chronic exposure. The “by-products” that some manufacturers consider “neutralized” can be toxic themselves. A recent study showed that some of these by-products are carcinogenic.

Potassium Permanganate is not used by Allerair

Certain types of activated carbon are treated with potassium permanganate to better adsorb VOCs. While this is an effective method of VOC removal, potassium permanganate releases manganese particles into the air. Chronic exposure to manganese at low concentrations in the air can cause a form of Parkinson’s disease called Manganism and other neurological damage.

Styrofoam & Plastic are not used by Allerair

Plastics are made from hundreds of different chemicals. There is one thing that they have in common: they all release toxic chemicals into the indoor environment. Plastics are made from petro-chemicals, and contain certain carcinogenic VOCs. Styrene, the chemical in Styrofoam, is similar to benzene. When air is blown by them, such as in a plastic air purifier, these chemicals are released into the indoor environment.

Are Allerair air purifiers effective?

Many air purifiers are just poorly engineered. While this is not going to make you sick, it isn’t going to make you any healthier either. People who spend money on products with these design flaws do so due to lack of quality information. Well designed air purifiers can be purchased for almost the same price as many inferior models.

Allerair air purifiers do not use attached filters

A deliberate design “flaw” used in many air purifiers are combined HEPA and carbon filters. The owner has to change both filters at the same time. However, the approximate filter life of a HEPA filter is 5 years, while a carbon filter should be replaced every 2 years. Combined filters force the owner of the air purifier to change the HEPA filter two and a half times more often than is necessary. This is not only a waste of a perfectly good filter, but also will add to the maintenance cost of the air cleaner.

Allerair air purifiers include pounds of carbon, not just a few ounces.

Many air purifiers claim to use activated carbon for gas and odor removal, but will not mention how much is in their filter. This is because they have simply coated a mat with a few ounces of activated carbon. In an average home, that small amount of carbon could get saturated in days, even hours. After this, the filter would need to be replaced or it would be doing nothing. If an air purifier does not make any obvious claims to the amount of activated carbon it uses, you should question the filter’s effectiveness. An air purifier without any activated carbon at all is really only half of a purifier.

Allerair air purifiers do not have poorly installed HEPA filters

Most air purifiers use HEPA filters, but many do not use it well. If air can seep around the filter instead of through it, the filtration process is not very effective. If the HEPA is not warmed before it is rolled and installed, it can crack, again drastically reducing its effectiveness. Many filters are pleated, but if they are not evenly spaced, the effectiveness decreases once again. Allerair filters use spacers to ensure even spacing.

Does Allerair stand behind their air purifiers?

Allerair air purifiers are covered by the best warranty in the business. A ten-year warranty on parts; 5 years parts and labor cover all of their home air purifiers, with an additional 5 years on all parts. That means every wire, switch, and motor is covered for an incredible 10 years.

Think of the last small appliance you brought for your home. How long was the warranty? 1 year? 5 years at the very most? Most companies today can’t stand by their products for longer because they’re manufactured with inexpensive, unreliable parts.

Review of Allerair air purifiers

Allerair’s air purifiers provide relief from asthma, allergies, MCS, and hyperreactive airway disease at home, office or while traveling. You can choose air purifier solutions that offer mold abatement, remove tobacco smoke and odor, and control chemicals and odors.

The AirMedic air purifier: The AirMedic provides better than HEPA filtration. With a filtration system that equals the standards of an EN 1822 certified filter the AirMedic will remove 99% of particles down to 0.01 microns, the size of bacteria and viruses. Definitely the best air purifier for protecting your family’s health.

The AirTube air purifier: Fully portable and excellent for hotel, smaller rooms, nursery, office desktop, or cubicle. Both units offer HEPA filtration and 4 or 7 pounds of acivated carbon.

The 4000 series air purifiers: Designed for air purification in areas up to 1200 sq. ft. the 4000 models feature HEPA filtration and 12 pounds of MAC-B carbon that can be customized to your particular environment. UV sterilizer models are also available in this series.

The 5000 series air purifiers. Designed for air purification in areas up to 1500 sq. ft. the 5000 models feature HEPA filtration and 18 to 28 pounds of MAC-B carbon that can be customized to your particular environment. UV sterilizer models are also available in this series.

The 6000 series air purifiers. Designed for air purification in areas up to 1800 sq. ft. the 6000 models feature HEPA filtration and 22 to 36 pounds of MAC-B carbon that can be customized to your particular environment. UV sterilizer models are also available in this series.

Knowing what sets the best HEPA filter air purifiers apart from the mediocre is becoming ever more important.

Why? Because growing public concern about indoor air pollution has moved many companies to cash in on the business of selling air cleaners.

But these companies often have no experience in the field of air purification. Their products are not always manufactured with the user in mind. Suitability of the technology used, soundness of construction and materials, overall effectiveness, and safety with respect to harmful byproducts may take a backseat to profits.

It’s up to you to sort through the multitude of air cleaner brands, models and bold claims.

What glaring flaws will you find in poor quality HEPA filter air purifiers?

The filter is not really a true HEPA filter

There are many sly dogs who want to capitalize on public familiarity with the term HEPA.

You may see air purifiers that claim to be HEPA-type, HEPA-like, microHEPA, microfiltration, 99% something or another, xxxxHEPA or HEPAxxxx, where xxxx may be any number of buzzwords. Don’t be fooled. HEPA filter air purifiers should plainly state that the filter is true HEPA or medical grade HEPA.

The filter uses HEPA media but cannot certify HEPA performance

HEPA filter media is essential as it is the only filter media capable of trapping 99.97% of particles as small as 0.3 microns.

But while the media may be true HEPA what if, due to poor construction, the filter is not?

HEPA filter media is a fine pleated paper and cheaply made media can suffer cracks at the folds that reduce actual efficiency. Be sure to insist on a medical grade HEPA filter that has been warm rolled to prevent cracks and laser tested to ensure integrity.

A manufacturer should be able to assure you the filter is free of defects and capable of actually performing at the rated efficiency of the media.

Air bypasses the filter, reducing the air cleaner’s efficiency

Many air purifiers are promoted as having true HEPA air filters, but these air purifiers do not have high efficiencies as a unit.

The reason is that the filter is not tightly secured in the housing with airtight gaskets to ensure against air leakage around the filter. These gaps reduce actual efficiency. This problem is often seen in air purifiers made with cheap, soft plastic housings that do not securely fit with the filter.

However, do not dismiss all plastic units. Hard, ABS type plastic is a suitable lightweight alternative to metal housings. This is the chosen material for IQAir air purifiers.

Cheap fan motors with no warranty or a very limited warranty

There is another reason the claim of HEPA filtration is not accurate in poorly designed air purifiers where some of the airflow bypasses the HEPA filter. The motor is at the heart of the problem.

A powerful fan and motor made with properly sealed bearings is an essential component of high quality air purifiers. The amount of clean air delivered to your home is directly dependent on the amount of air you can pass through the filter media. The more the better.

A well sealed system with tight gaskets is going to build up a lot of back pressure that requires a strong motor to overcome. Such a motor must also resist the buildup of heat due to strenuous duty. A suitable motor thus adds considerably to the expense of a quality air purifier. Air purifiers with enough fan power can also be noisy, up to 70 decibels.

In order to offer the public a cheap air purifier, designers start with a cheap motor. To accommodate an inferior motor, air is permitted to bypass the filter. This relieves the back pressure and thus the strain on the motor. It also allows the bypassing air to help cool the motor, thus extending its life and reducing warranty claims. This deliberate bypassing and weaker motor combination also helps reduce noise, which seems to be a concern of many consumers.

However the end result is a poorly performing, inefficient, mass market “HEPA air purifier”.

Price may serve as no guide

Most evil of all, these non-performers may not be “cheap” at all. Some are priced similarly to or even higher than superior quality air purifiers in an effort to be viewed as being of the same caliber.

Who offers top quality true HEPA filter air purifiers?

Each of the companies below manufactures some of the best HEPA filter air purifiers available for home use.

• Allerair air purifiers come in over 100 models, most providing true medical grade HEPA filtration. Allerair offers excellent filtration for an economical cost.
• Austin Air.
• Blueair air purifiers use a special approach to HEPA filtration. In addition to providing a large surface area filter, Blueair filters have larger openings in their polymer based media. This allows a much higher airflow and thus requires a smaller, less noisy fan. The trick in these air purifiers is the addition of electrostatic brushes in the airflow prior to the HEPA element. This charges particles and gets them to “stick” electrostatically to the filter media. Blueair thus offers the quitest HEPA filter air purifiers available.
• IQ Air.

Are air purifier manufacturers that claim an activated carbon filter pad can remove chemicals and odors deceiving you?

Many air purifiers use activated carbon for gas and odor removal, but will not mention how much is in their filter. This is because they have simply coated a mat with a few ounces of activated carbon.

In an average home, that small amount of carbon could get saturated in days, even hours. After this, the filter would need to be replaced or it would be doing nothing.

If an air purifier does not make any obvious claims to the amount of activated carbon it uses, you should question the filter’s effectiveness.

To learn more about activated carbon for air purification view these additional articles:

• Why is activated carbon filtration essential in your air purifier?
• Activated carbon air cleaner report | The purifiers that really perform
• Choosing activated carbon filters | How to evaluate air purifier quality
• Activated carbon for odor control in your home

Why an activated carbon filter pad doesn’t give you the air purification you expect

Air purification is big business. Realizing the demand for air purification, many companies have entered the air purifier market.

However, you should take note: These companies are not air purifier manufacturers whose sole business is air purification. They are consumer product sales organizations. Most manufacture nothing at all, but contract design and production to others. Their primary concern is to blanket the market with whatever is the hot seller of the day.

Eager to gain the approval of consumers by giving the appearance of quality and superiority, they hype the fact that they offer a “multistage” air cleaner that can control all sorts of air pollution.

Activated carbon filters are usually featured as one of the stages in these air purifiers. They typically take the form of a foam mesh impregnated with a few ounces of activated carbon.

Is this really good enough? Are these companies really being honest? What about those manufacturers that offer a deep activated carbon bed that includes many pounds of activated carbon?

Question the quality of the activated carbon

First of all, lets bring up the question of the quality of the activated carbon. Activated carbon can vary greatly depending on the methods used to produce it. For instance, the surface area available to adsorb pollutants can vary between 400 sq. meters per gram to over 1500 sq. meters per gram.

Also, it is true activated carbon can generally remove some of any chemical. However, raw activated carbon may not be very effective against some of the very pollutants you’re concerned about. That’s why activated carbon needs to be impregnated with special catalysts and chemisorbers to ensure maximum effectiveness against the pollutants you wish to target.

Air purifiers using an activated carbon filter pad never address these issues in any of their consumer literature.

Question the quantity of filtration

How much chemical contamination can a few ounces of activated carbon adsorb?

Activated carbon can adsorb as much as 60% of its weight in pollutants. This is best accomplished by increasing the “dwell time” or time spent in contact with the pollutants.

An activated carbon filter pad cannot supply much in the way of dwell time. This is why air purifier manufacturers whose real business is nothing but air purification include a deep activated carbon bed that often weighs many pounds.

Question the design of the air purifier

Activated carbon filter pads are often used as a prefilter in front of a higher efficiency particle filter. This exposes the activated carbon to the incoming stream of dust and microparticles. The structure of activated carbon is that of macropores branching into ever-smaller micropores. Incoming particles can easily clog these larger pores and prevent gaseous contaminants from entering the micropores where adsorption takes place. Using an activated carbon filter pad as a prefilter is a bad design decision.

Another bad decision that seems to defy all common sense is the inclusion of scent cartridges in air purifiers with activated carbon filter pads. Since activated carbon is supposed to remove odors and volatile chemicals from the air, why is a source of volatile chemical fragrance included? This seems to defeat the purpose of the activated carbon. The reality is that the scent masks the odors in the air and is intended to lead you to believe the air purifier is doing a good job.

Purification with activated carbon works if you choose the right air purifier

Activated carbon filters have real value when they take the form of a deep activated carbon bed. There are several air purifier manufacturers that design and build there own products with this in mind. Some examples are Allerair, Austin Air, Blueair, and Iqair. These companies understand that a large volume of activated carbon is essential for air purifier performance.

Activated carbon filter pads are a gimmick of marketing companies. These sales organizations are only interested in grabbing a piece of the air purifier market with inferior products. They rely on the absence of consumer education about air purification to succeed.

You can make a much better choice.

• Discover why the best air purifier for your needs includes HEPA filtration.
• Build the foundation you need to buy air purifiers like an expert.
• I’ll show you how…

HEPA Filters Meet The Challenge of Medicine

Your air purifier should clean your air sufficiently to give you real health benefits.

Will a HEPA air purifier provide you with these benefits better than any other?
What do you think? Would you trust the choice of hospitals as a guide to the best air purifier?

Medical facilities need air purification to control infectious microbes that spread through ventilation systems causing illness and death. Thus operating rooms, outpatient surgery, labor and delivery, isolation rooms, intensive care and other areas require high efficiency filtration.

The American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE), the American Institute of Architects, (AIA) and the Joint Commission for the Accreditation of Healthcare Organizations (JCAHO) all recommend HEPA filters for medical facilities.

Likewise, in Guidelines for Environmental Infection Control in Healthcare Facilities, the CDC recommends HEPA filtration to remove airborne contaminants. No other air purification method receives this endorsement.

If a HEPA filter is the best air purifier choice for hospitals then what is your best choice?

The Best Air Purifier For Health Benefits Is HEPA

Only HEPA filter air purifiers have the efficiency you need to improve conditions like:

• Allergic rhinitis
• Allergic conjunctivitis
• Asthma
• Allergic sinusitis
• Allergic bronchitis
• Animal allergies
• Chronic Obstructive Pulmonary Disease (COPD)

A HEPA filter air purifier is effective at removing many types of airborne allergens, asthma triggers and infectious agents such as:

• Pollens
• Molds and mildews
• Dust mite debris
• Animal dander
• Cockroach debris
• Tobacco smoke

Facts About The Best Air Purifier Technology

HEPA stands for High Efficiency Particulate Air filter. A HEPA air filter must be 99.97% efficient, allowing no more than 3 particles in 10,000 to penetrate the HEPA filter media.

HEPA air filters were developed to contain radioactive particles at nuclear facilities. Since then, HEPA air purification has been used in industrial, medical and military clean rooms.

There are two very different types of air filters on the market that use the term “HEPA”.

• A true HEPA filter must remove 99.97% of all particles 0.3 microns in diameter.
• HEPA-type filters use similar media as true HEPA. However, their efficiency may be no more than 55% at removing particles regardless of diameter. These filters are much cheaper than true HEPA filters.

Avoid products that hijack the HEPA term but provide no performance guarantee.

HEPA filter material causes a great deal of resistance to airflow so a powerful fan is needed to push air through the air purifier.

Because of this resistance neither a HEPA air conditioner filter nor a HEPA furnace filter is practical. A whole house HEPA filter system is not recommended as your best air purifier choice. They filter only a portion of the air passing through your ductwork and provide you with less benefit than HEPA room air cleaners you can place wherever needed most.

HEPA filter replacement is essential to best air purifier performance. Your HEPA air purifier filters need to be changed when they are dirty or else your clean air will steadily dwindle. How often they need to be changed depends on several factors:

• How large the air purifier HEPA filter is. The greater the surface area of the filter the longer it will last. Some filters can exceed a five-year useful life expectancy.
• The best air purifiers use a prefilter. Prefilters stop larger particles from reaching the HEPA filter. Prefilters can often be cleaned and allow the HEPA filter to last longer.
• The kind of environment where the filter is being used. Homes with mold, pets or smokers require filter changes more often.

Now that you understand why HEPA filters are at the heart of the best air purifiers as well as some background information it’s time to move on.

I’d like to invite you now to consider why not all HEPA filter air purifiers are created equal and how it affects your choice of the best air purifier.

Do you have allergies, asthma or other respiratory troubles? HEPA room air cleaners are often presented as a complete one size fits all solution. I personally use a HEPA air cleaner in my own home, so my position is that they do offer benefits.

However, I find that much of the marketing is a little overly enthusiastic to put it kindly. Some claims simply are not supported by the research and the true measure of benefit is not as you might be led to believe.

The reality is the air in your home is influenced more by what you put into it than what you can take out of it. Does that sound reasonable?

HEPA room air cleaners can and should be only one part of a greater effort. My purpose in this article is to discuss some of the most common reasons for buying a HEPA filter air purifier and to what extent that air purifier will really help. I also will offer some alternatives that are even more effective. When these steps are taken together with air purification you’ll see the best results.

HEPA Room Air Cleaners For Seasonal Allergies

HEPA filter air purifiers are a great benefit if you suffer from seasonal allergies. HEPA filters trap both large and small particles so you aren’t breathing them in. Allergy triggers that cause itchy, water eyes, sneezing, and coughing are effectively removed from your air allowing you to breathe easy. This is one of the best uses for HEPA filter air purifiers.

HEPA Room Air Cleaners For Pet Allergies

If you have pets and you or someone in your home is allergic, then an air purifier may help the situation. However there are limits.

Cats are especially allergenic and are prolific creators of allergen. Worse yet, their allergen aggravates sensitivity to other allergens like pollen, making the allergic person even more miserable. One Japanese study found levels of cat allergen 160 times that of dust mite allergen in a typical home. The primary cat allergen, Fel d 1, is not only airborne but sticks to surfaces and textiles throughout the house. The allergic person is as likely to contact it via household furnishings and objects as to breathe it in.

A cat can also be compared with a lit cigarette; as long as it is present the continuous pollution exposes you even as the air purifier tries to remove it. Most studies have found air purifiers provide limited benefit to households that keep pets indoors. The best option is to remove the pet entirely. Even then pet allergens can take 6 to 12 months to subside from carpets and furnishings sufficiently for the allergic individual to be symptom free.

Some place the air purifier in a specific room, such as the bedroom, and forbid the pet from entering. This helps create a safe room for the allergy sufferer to go to for relief. However, the best option is to eliminate the source by removing the pet. Once you’ve come to grips with this reality, an air purifier will remove residual background allergens and help you breathe easier.

HEPA Room Air Cleaners For Dust Mite Allergies

Dust mites are tiny organisms that live off material such as dead skin flakes.

The dust mites themselves are not likely to ever become airborne and so a HEPA filter air purifier is not going to become a breeding ground for them as some competing air cleaner marketers wrongly claim. However, particles from their droppings and dead bodies can contaminate the air and a HEPA filter air purifier will remove these.

In all honesty though, most persons encounter dust mite allergen through their mattress and bed sheeting. Since your face is essentially lying upon the source of allergen an air purifier elsewhere in the room has limited effect with this allergen while you are sleeping.

Pillow and mattress casings specifically designed to prevent dust mites are your best option for reducing this exposure. Regular washing of sheets in hot water is also helpful. Dehumidifiers that keep humidity low also prevent them from multiplying since they require moisture from the air to live and breed.

HEPA Room Air Cleaners For Asthma

HEPA filter air purifiers are the most effective way to improve your indoor air if you suffer from asthma. Asthma triggers saturate indoor air and an HEPA filtration can help to diminish them.

There are many HEPA air cleaners on the market today designed to target asthma triggers. They can add a real piece of mind, knowing you are doing all you can to stop an asthma attack before it starts. For asthma, you may also wish to choose a unit with substantial carbon filtration, to address things like perfumes and other indoor chemical pollutants that can aggravate asthma conditions.

HEPA Room Air Cleaners For Smoke

Smoke: Smoke from your fireplace, cooking, or tobacco are potent irritants that can aggravate many respiratory conditions as well as cause them in otherwise healthy persons.

Getting rid of the smoke through source control is a far better choice than any air purifier. However, for intermittent exposures HEPA filter air purifiers coupled with activated carbon can quickly clear the air of both smoke particles and odors.

If this is your number one concern, then choose a unit that is specifically designed to handle this problem. There are air cleaners with specialized carbon blends designed to handle smoke more effectively than standard models. Allerair offers a number of excellent smoke air purifiers.

HEPA Room Air Cleaners For Multiple Chemical Sensitivities

Chemical sensitivity can be divided in two categories.

First, some individuals are sensitive to one chemical or a number of chemicals present in their home and need an air purifier to address this specific issue. A high-quality unit with ample carbon and good filtration will be able to solve this problem easily.

The second type of chemically sensitive person is one who is highly reactive to most chemicals they come in contact with and, in general, that includes the glues, filters, and plastic material found in many air purifiers.

If you feel you fall into the latter, don’t despair. There are great units on the market that are specially made not to off-gas.

When you are ready to purchase a unit, just remember you want to take special care in choosing your air purifier, as many units claim to not off-gas but still do. Individuals with severe chemical sensitivities should only consider air purifiers designed for individuals with these specific needs. Typically, these are going to include large quantities of activated carbon, often specially blended to give added control of specific vocs.

The key to picking the right air cleaner for your indoor space lies in knowing what problems you want the unit to address.Some air purifiers can be custom created to suit a variety of needs, such as customer-specific carbon profiling to make sure you get the right activated carbon for your chemical sensitivity.

Allerair provides this service prior to purchasing their MCS model air purifier. A sample carbon test kit is sent to you to determine your sensitivity to a variety of carbon blends. Once you have indicated which one is most acceptable they will include that blend in your new air purifier. The cost of the test kit is deducted from your air purifier’s purchase price.

How to eliminate 95% from consideration now.

Which air purifiers are best?

It’s good to have choices, but not when you’re unable to choose confidently.

Comparing air purifiers for the home is confusing for many consumers.

The bewildering claims made for each type may make it difficult to focus on the best air cleaner for your needs.

If you’re already familiar with the secret to top performing home air cleaners then you’re ready to use that standard to rate each type of air cleaner.

More importantly, you’re ready to completely reject poor performers.

True HEPA Air Purifiers – The Industry Standard

Unsurpassed filtration efficiency

Only HEPA air filters meet a verifiable performance standard.

HEPA filters remove 99.97% of 0.3 micron particles, slightly smaller than tuberculosis bacteria at 0.4 micron.

One misconception is that HEPA filters perform less well with smaller particles. In reality, HEPA efficiency is higher with smaller particle sizes.

An effect called Brownian diffusion helps trap particles smaller than 0.3 micron in the HEPA filter, enabling it to capture bacteria and viruses.

Because of this incredible efficiency the Hong Kong Hospital Authority chose HEPA air cleaners like the IQAIR HealthPro at right to control the spread of the SARS virus.

HEPA filters may last two to five years. Thus, your actual cost for exceptionally clean air may be quite low in comparison to air cleaners that require filter replacement every few months.

HEPA Type – Poor Imitations Of The Real Thing

Reject cheap air cleaners

A mark of cheap air purifiers, HEPA type filter media may provide no performance indications or specify a standard clearly less than true HEPA.

These air cleaners will not give you significant air quality improvement.

Why? Because total system efficiency is often no greater than 50%.

The Holmes air purifier at left claims a filter efficiency of 99% at 2 micron. This is much larger than the most harmful fine and ultra fine particles.

Filters like these may be completely unable to collect the sub-micron to 2.5 micron particles that most seriously affect your health.

Even larger particles up to 10 microns, like pollen, may not be removed effectively due to filter bypassing common in cheap air cleaners.

Short filter life is also common. The greatest scam on the market is to sell cheap air cleaners and bilk customers later with costly filter replacements.

Electrostatic Precipitators – AKA Ionic Air Purifiers

Reject ionic air cleaners

Ionic air purifiers use electric charges to remove allergens and irritants. They have no effect on gases and odors.

Particle collection efficiency tends to be no greater than 80%.

Studies show efficiency dwindles to as little as 20% in as few as three days as collector plates load with particles.

Regular cleaning is a must for continued performance, yet many owners complain it is difficult cleaning collector plates.

These models are praised for being silent. This is a marketing ploy designed to present as an advantage the fact that they move little air.

Ionic air cleaners also produce ozone which is lung damaging and elevates sensitivity to allergens and irritants. This is the last thing anyone with respiratory problems should be exposed to.

Air Ionizer Purifiers – Wishful Thinking At Best

Reject air ionizer purifiers

Ion generators, or air ionizer purifiers, release charged ions into the air that attach to particles, statically charging them.

There is no method of capturing these charged pollutants.

Instead, they stick to surfaces such as walls and furniture or combine with other particles and settle on room surfaces.

This produces the common problem known as “black wall effect” buyers of these units complain about.

The most significant problem with air ionizers is the health threat posed by the “black wall effect” taking place in your lungs.

Studies have shown electrically charging very fine particles results in their higher deposition rate in the lungs compared to uncharged particles.

So using ion generators may actually increase the dose of particles to the lungs, making your situation worse than if you were using nothing at all.

Ozone Air Purifiers – Hazardous To Your Health

Reject ozone machines

Proponents of ozone generators claim ozone oxidizes pollutants, reducing them to water and carbon dioxide.

In the real world such textbook reactions rarely happen. Instead, numerous by products are created.

These byproducts can be more dangerous than the original pollutants.

Ozone cannot distinguish what is and is not a pollutant. It reacts with almost anything it contacts, degrading materials and creating additional pollutants.

Supporters claim ozone kills bacteria but deny it kills cells in your airway. They reject all scientific evidence and warnings that ozone is harmful.

Sellers of ozone machines are perpetrating a fraud. They get away with it in the US because no federal agency regulates these products. On the state level, at least California has banned their sale.

An ozone generator is ineffective and exposes you to danger.

UV Air Purifiers – Is This Extra Really Necessary?

Is UV light worth the cost?

UV air purifiers create ultraviolet light that may destroy some biological pollutants like viruses and bacteria. Higher doses of UV light may be reqiured than than a home air purifier

UV air cleaners have no effect on gases or particles. UV germicidal irradiation should not be used to replace filtration.

Because HEPA filtration captures most biological pollutants, adding UV light sterilization offers minimal benefit.

Because mold spores can cause allergic reactions whether dead or alive, UV sterilizers or sanitizers by themselves will not help your allergies or asthma.

Photocatalytic Air Purifiers – New, But Is It Better?

PCO is of limited benefit

Photocatalytic air purifiers are promoted to destroy gases and odors.

They have no effect on particulates despite the fact that some marketers would have you believe this.

Titanium dioxide (TiO2) is used as a catalyst in the presence of UV light to cause a chemical reaction between volatile organic compounds (VOCs) and water molecules in the air.

Ideally this reaction reduces gases and odors to water vapor and carbon dioxide.

Unfortunately, textbook reactions are not always the result.

Incomplete destruction of VOCs results in creating additional pollutants that may be more irritating and potentially toxic than the original compounds.

Activated Carbon – Chemical And Odor Control

Activated carbon for gases and odors

Gas phase filters remove gases and odors and are often added to HEPA filtration to enhance air cleaning.

The most effective gas filtration is by activated carbon. It removes up to 60% of its own weight in chemicals.

A deep bed of activated carbon is best. That is why the best home air purifiers include many pounds of activated carbon.

Thin activated carbon pads are practically worthless. They neither have sufficient activated carbon to be effective nor do they supply the dwell time needed to remove pollutants.

Rather than a competing technology, gas filtration is complementary to HEPA air purification. Combined with HEPA air filters it creates the most effective air cleaning available.

So, What’s Your Next Move?

Why not learn more before choosing?

Buying air purifiers for the home is a serious matter.

Please carefully consider your needs and research what will meet them.

I cannot overemphasize how important this is.

I face MCS, allergy and asthma daily in my family.

By carefully comparing air purifiers for the home I proved to myself that HEPA filters combined with large capacity activated carbon chemical removal was best for my own needs.

Why not take the time now to consider convincing proof why hepa filters are best?

Do you dread the thought of buying a HEPA air purifier online?

Online air purifier information is often contradictory, blatantly false or even incomprehensible. Almost all of it is nothing more than calls to “buy me, buy me, buy me”.

You deserve a simpler, helpful air purifier guide.

It shouldn’t waste your time.

That is what I hope you find in this guide to buying HEPA air purifiers. Please take a few moments to see if it answers your questions. All you have to lose is hours of pointing and clicking elsewhere.

About HEPA Air Purifiers

Portable HEPA filter air purifiers are designed to remove particles from the air like dust, pollen, pet dander, allergens, bacteria, and viruses.

HEPA filtration is used in hospital operating rooms and intensive care units for just such purposes. HEPA filters are recommended by government agencies as helpful in controlling communicable diseases like tuberculosis, SARS, influenza, bird flu and other infectious agents.

Most incorporate add-on technologies like activated carbon or germicidal UV lights to extend performance beyond what the HEPA filter media can achieve.

When buying a HEPA air purifier you’ll find models designed for specific problems. There are air purifiers available for particle filtration, smoke and odor removal or relief for allergy, asthma and multiple chemical sensitivities.

Understand the Features of HEPA Air Purifiers

HEPA Filters

A true HEPA filter removes 99.97% of particles 0.3 microns in size. Many sites state “and larger” implying this is best-case HEPA filter efficiency. This shows a lack of understanding about HEPA filter material. The efficiency rating is not the best a HEPA filter can do, but the worst.

To understand, picture a child throwing balls at multiple layers of chain link fence. Tennis balls do not pass at all. This represents particles larger than 0.3 micron.

Ping-pong balls represent particles smaller than 0.3 micron. They are smaller than the gaps but lack the mass necessary to bully through the layers. An effect called diffusion causes particles to follow an irregular path. Picture a ping-pong ball corkscrewing through the air. It could never pass through the fence layers.

A golf ball is small enough and has the mass to follow a more direct path to avoid being stopped by the layers of fencing. This represents particles 0.3 micron in size. This is referred to as the Most Penetrating Particle Size.

A HEPA filter’s worst performance is at 0.3 micron. All other particles, whether larger or smaller are stopped with greater efficiency. This makes HEPA filter air purifiers ideal for removing allergens such as pet dander, dust mite residue, and pollen. These air purifiers are beneficial for those who suffer from respiratory conditions like asthma and allergies.

Activated Carbon Filters

Activated carbon filters are often used within HEPA filter air purifiers to remove odors and chemicals from the air.

An activated carbon air filter contains specially treated carbon that has had millions of tiny pores opened up enabling it to trap gases by a process called adsorption. The adsorption occurs when chemicals are attracted to the activated carbon by a force known as the van der Waals force.

An activated carbon filter is able to adsorb a wide range of chemicals up to 60% of its own weight. Once the carbon reaches its full capacity the filter needs to be replaced. How often will depend on the contamination level of the environment and how much carbon you have to begin with. This is why a HEPA filter air purifier that includes many pounds of activated carbon is recommended on this site.

Activated carbon filtration is most often used to adsorb:

• The chemicals in smoke (from cigarettes and fireplaces)
• Formaldehyde and other volatile organic compounds (from furniture, carpet glues, paints, plastics, new building materials, etc.)
• Odors (pet, kitchen, urine, etc.)

Pre-filters

Pre-filters help trap large particles before they reach the HEPA filter. Having this pre-filter is a great benefit. It helps extend the time between filter changes and keeps the unit working more efficiently.

Costs of HEPA Air Purifiers

The price of HEPA filter air purifiers can range from the low 200s to more than 1,000. Deciding whether to choose the low-end or high-end model can be confusing.

There are real differences in models, total capacity, actual system efficiency (not to be confused with the HEPA filter efficiency), and additional features like germicidal UV light or photocatalysis. The quality and quantity of clean air coming out of the unit is the basis of how each air purifier is different from one another.

You don’t have to be an air purifier expert to figure out which unit is best for your needs, you simply need to consider clearly what your needs are. For example, you might ask the following questions to get the process started:

• Why am I getting this unit? Allergies, asthma, chemical sensitivity, odors?
• Is it for a single room? Or am I trying to clean all the air in my house?
• How big is my space (estimated square footage and consider high ceilings)?
• How long do I expect the unit to last?
• What is my budget?
• How much does it cost to maintain/replace filters?
• Do I want special features, like a “change filter” indicator light?

Answering the above questions is a useful method to help you decide what type of unit you need to address your specific indoor air issues.

Maintaining Your HEPA Air Purifier

Maintaining an air purifier is an important part of keeping the unit working effectively, and there is a certain amount of cost and effort involved. Certainly air purifiers work for a time as a “turn it on and forget it” appliance; however, to get the most out of your investment you must keep the filters changed as needed.

The cost of filters varies by unit and by type of filter, so it is important to check the price point on filters and the frequency of filter changes before you decide to purchase. Also, consider the environment in which you want the unit to function.

For example, if you smoke in your home and you want a unit that will help to filter the smoke and the smell of the smoke, you will want a unit with an ample amount of carbon. You should evaluate the cost of replacing carbon filters as they become saturated.

HEPA Air Purifier Size And Efficiency

Air purifiers work best in the room they are placed in, and lose effectiveness the further you move away from that room. Single-room units cannot effectively clean the air in your entire house, as only the air that gets sucked into the unit gets cleaned. However, multiple units, or single-room units in combination with a whole-house unit is the best choice for total home air purification.

When choosing what size unit to buy, you should consider the size of the area you want to clean. Ideally, your air cleaner should be able to provide five to six air exchanges per hour. However, any calculation of air exchanges per hour is only a foundation for helping you consider how a unit will perform in your home. This is because factors like the design of your home, which affects air flow from room to room, ceiling heights, the amount of furniture in your home the air must circulate around, the insulation of your rooms/home, and the amount of indoor air pollutants, such as pets and dust all impact an air purifier’s ability to clean the air.

Air purifiers are rated by the cubic feet per minute (CFM) of clean air they deliver. You can determine how large an air purifier you need by determining the cubic feet of the room you wish to use it in. Multiply the length, width and height of your room. This gives you your room’s cubic feet. Divide that number by five; for the number of air exchanges you need to have. The final number is the CFM necessary to give you those five air exchanges. You should then look for air purifiers rated at that capacity or greater.

Another consideration when it comes to efficiency is the fan in a unit. A general rule of thumb is the larger and stronger the fan, the more air the unit can clean and the faster it can clean it. A unit with multiple fan speeds will allow you to customize your air cleaner to better suit your needs. Choosing a unit with sufficient capacity to clean your air on a low setting will also mean quieter operation for you.

Also, remember an air purifier can improve the quality of your indoor air, but it cannot eliminate pollutants completely. It won’t suck all the dust from your hard surfaces or prevent pollen from entering your house. However, it will help you to breathe easier, lessen your allergies, and give you a piece of mind that indoor air contaminants are minimized.

The Elusive Silent HEPA Air Purifier

You cannot find silent HEPA air purifiers because they must physically force air through the filter using a motorized fan. While HEPA air purifiers are not silent, the amount of sound they produce varies considerably. Many factors contribute to the sound level and whether you will be disturbed by it.

The most common area air purifiers are placed is the bedroom. However, this is the number one area where people find the sound the most intrusive. The ideal way to have a quiet HEPA air cleaner is to choose a unit that can clean the room air at its lowest setting.

Another option is to choose one of the Blueair air purifiers. These are not technically HEPA air purifiers but they achieve HEPA grade performance. They are a hybrid design that uses an ionizer ahead of the filter to boost collection efficiency of the filter. The filter itself offers lesser resistance to airflow than a standard HEPA filter. This lesser resistance means a lesser fan and quieter operation.

Either way, it is important to understand that a sound will come from these units and it’s just a matter of finding the level of sound you are comfortable with.

Many units list the decibel rating of the system at each fan speed. You can compare these ratings to other indoor appliances, such as the level of sound you hear from a normal box fan or the hum of the refrigerator, which can give you a point of reference.

Sound is different to each individual, and even decibel results can sometimes be misleading as many things can affect sound level, such as position of the unit, carpeting, furniture, distance from the unit while it is running, fan speed, etc.

Additional Features In HEPA Air Purifiers

Many air purifiers special features that can greatly enhance your air cleaning experience. These features add convenience to your life and give you the additional options that allow you to optimize your air purifier to best fit your needs. Some of the special features to consider when shopping for your air cleaner:

• Casters for ease of mobility
• Remote control
• Digital controls
• Multiple fan speeds
• Handles
• Ease of filter change
• Filter-change indicator light

If you would like to protect your health from indoor air pollutants then buying a HEPA filter air cleaner is a practical first step.

Of course, that is easier said than done. Widespread concern over indoor air pollution has created a market filled with half measures, to be generous. The odor of cash bearing customers is the one odor most air purifiers are designed to handle best.

Are you concerned about the harm poor indoor air can do to your family? Do you believe you deserve true value for the money you invest in your family’s health? Before you entrust your family’s health to any air purifier shouldn’t you determine if it is really adequate for your needs?

What standards should you use when buying a HEPA filter air cleaner?

Certainly not price. Inferior products are often priced similarly to the best air purifiers simply to be perceived as being of the same caliber.

What is needed is a clear and simple home air purifier guide. The air purifier information you find throughout this site and the following guidelines will help you make an informed decision.

Features to look for when buying a HEPA filter air cleaner

Buy a HEPA filter air cleaner designed for years of minimal intervention and maintenance

Cheap air purifiers can often be much more costly in the long run. Think about it, how do they reduce the cost?

By building around a cheap motor that can’t meet the challenge of a large area HEPA filter. This means reducing the size of the filter and allowing bypassing of air around the filter to reduce backpressure and also to help cool the lesser quality motor.

What does this mean to you? Smaller filters require more often replacement due to loading and thus greater maintenance cost for you.

These cheap motors can be spotted chiefly by short warranty periods. Of course, they’ll fail as soon as the warranty expires!

You should look for air purifier manufacturers that are willing to stand behind they’re product five or even ten years as Allerair does.

Look for assertions that the motor uses closed, sealed motor windings. These give you clean operation without off gassing and burning smell, a problem owners of cheap air purifiers complain about.

Quarterly maintenance should only take a few seconds to replace or clean the prefilter. The life expectancy estimated for the HEPA filter should be three to five years depending on the environment where it is used, such as a smoking home versus a nonsmoking one.

Activated carbon filters likewise should last as long as possible, but this often depends on the total quantity of carbon in the filter and the circumstances of use.

Buy a HEPA filter air cleaner that can remove odors and harmful chemicals

Any HEPA filter air cleaner should also include a large activated carbon bed. No particulate filter, even HEPA, will remove gases and odors. Effective removal of gaseous toxins requires a large bed of activated carbon to ensure sufficient dwell time to trap the gases.

All high quality air cleaners offer many pounds of activated carbon to trap noxious gas and odors. The deep bed of activated carbon has the capacity to adsorb thousands of chemicals, gases and odors that can cause health problems for you and your family.

Most air cleaners have a only a thin layer of carbon sprayed on a mesh. Which is not enough to make any real difference. Its sole purpose is to enable cheap air purifiers to add another bullet point on their feature list. Many retail corporations in typical “me too” fashion have jumped on the air purification bandwagon by contracting with manufacturers to build snazzy looking but poor performing air purifiers.

Why buy an “air purifier” with only a few token ounces of carbon sprayed on a mesh? It’s only going to add to your filter replacement costs while providing no real benefit.

Also, consider a manufacturer that offers a wide variety of specialized blends of carbon and catalysts so you can customize the air purifier to your needs. For instance, a care facility where urine odors are common would require a different carbon blend than a beauty salon or welding shop.

Likewise, someone with MCS may need an air purifier specifically designed for MCS sufferers. Even then, some activated carbons may prove unacceptable due to source or added chemisorbers and catalysts. Allerair offers a test sample kit of carbons for an MCS sufferer to determine beforehand if a particular carbon blend is problematic.

Buy a HEPA filter air cleaner that is durable and safe with nontoxic construction

Would an “air purifier” company have your best interests in mind if their unit were itself a source of pollutants?

The best air purifiers have a solidly built housing with high quality gaskets and seals to ensure no leakage of air around the filter.

These internal components should be sealed with a glueless gasket that protects you from odors and volatile organic compounds that off gas from the glued rubber gaskets found in most other air cleaners. Look for an air purifier that the manufacturer assures you will not outgas VOCS from the sealants used.

A durable all metal housing will never expose you to off-gassing vapors like many cheap air purifiers that are all plastic in their construction. It also maximizes filtration of your air by providing optimal airflow through the filter as opposed to bypassing the filter because of allowing for a tight seal.

However, don’t dismiss the use of plastics entirely. Soft plastics are often a problem, both in out gassing VOCS and failing to maintain an airtight seal around the filter.

Hard ABS plastic such as is used in quality leader IQAir does maintain a firm seal with the filter and is not prone to giving off VOCS. In fact, IQAir is the only manufacturer to certify their purifiers as a whole to be 95% efficient. So plastics, the right kind of plastics, can be put to good use.

Also, as mentioned earlier, the motor can be a source of contaminants as it heats up. High quality, sealed bearings and motor windings, even unvarnished motor windings, will help eliminate burning smells coming from the motor.

One last point, no high quality air purifier attempts to mask its failure to perform with scented fragrance cartridges. The last thing anyone needs in their home is more petroleum based VOCS, no matter how sweet or “natural” they may smell.

Buy a HEPA filter air cleaner that doesn’t cost you a small fortune over the life of the purifier

Would you like to know the “dirty little secret” of the air purifier industry?

Filter replacement costs! A cheap air purifier can cost you a fortune in regular filter replacements. In fact, it is one of the biggest scams going: Sell a cheap air purifier to an unsuspecting consumer, then require filter replacements every three to six months that cost almost as much as the unit itself!

Unlike air cleaners that incorporate filter elements in a single cartridge, high quality air cleaners separate the HEPA and carbon filters to allow for individual replacement. You save the cost of replacing both filters when one is used.

You ultimately save due to the long life of your filters when buying high quality air cleaners. Your HEPA filter should last three to five years under normal home use and the carbon filter two to three years.

Only pre-filters require regular replacement every 3 months. Some of these can be vacuumed and reused.

This approach to filter life and replacement gives you the lowest long-term costs.

Speaking of filters, did you know many air purifiers are not living up to their owners’ expectations?

Why? Even though they are advertised and sold as HEPA filters they do not, as a unit, provide HEPA filtration. The HEPA designation only applies to theoretical efficiency.

In actual practice improper seating, poor construction, and cracks in the media due to cheap construction severely limit actual performance.

The best method used to manufacture HEPA media is what is known as “warm rolled”. This prevents cracks from forming in the HEPA media, cracks that allow pollutants into your air. Also, a HEPA filter air cleaner should use separators between the pleats of the filter to maintain proper spacing and allow for maximum airflow and top performance of the filter.

Buy a HEPA filter air cleaner that doesn’t harbor illness-causing germs

Because a HEPA filter air cleaner can trap microbes in the media they sometimes become a breeding ground for potentially harmful pathogens.

Allerair air purifiers include two anti-microbial wraps, one on either side of the carbon bed. This suppresses any microbe growth and ensures that your air purifier will always protect your health.

Other manufacturers’ products should likewise be evaluated as to whether they include some means of eliminating mold and bacteria growth in the filter media.

If it doesn’t specifically state how or even if microbe growth is prevented then you can be certain no protection is offered at all.

What is the foremost reason people give for not buying a HEPA filter air purifier? HEPA filter replacements!

So, why are filterless air cleaners preferred while HEPA air cleaners have become persona non grata in so many homes?

Much of it has to do with marketing, especially by Sharper Image, which managed to gain as much as 25% of the air purifier market before going bankrupt. Their infomercials implied noise, mess, a need for tools for filter changes, and expensive HEPA filter replacements as reasons to choose their product.

Most vendors of ionic air purifiers have followed suit in promoting their versions of filterless home air cleaners. Air cleaners that rely on HEPA filter media have taken a black eye as a result.

It’s true that some air cleaner marketers have abused customers by selling a cheap air purifier only to gouge them with regular replacement of high priced filters. Some of these models are presented as being HEPA because they use HEPA filter material. The reality is their poor quality construction means that actual efficiencies are a far cry from true HEPA air cleaners.

Can HEPA filter replacements be easy?

No filters is not only promoted as being more economical but easier to maintain. No tools needed, cries the delighted infomercial actor. The reality is that most HEPA filter replacements can be done without tools and without the “messiness” they also claim you’ll suffer. It usually takes no more than five minutes, including the time to take the filters out of the packaging and the packaging out to the garbage.

Compare that to the time spent cleaning the collection plates on an ionic unit every few days. Since collection efficiency can degrade to as little as 20% in as few as three days, maintenance cleaning should be done often. How much time will you spend cleaning collection plates over the next five years, the projected life of some HEPA filters?

Which brings me to an economical feature of HEPA air purifiers: HEPA filter replacements may only be needed once every five years. This keeps your maintenance requirements low and your air purifier cost low. Both of these goals appear to be foremost on the minds of those who are considering going filterless. HEPA air cleaners that can achieve this while giving you the superior performance of HEPA filtration are surely worth considering, wouldn’t you agree?

The most economical HEPA filter replacements

Which companies offer HEPA quality air purifiers with a long filter life?

There are many excellent products available from companies like IQAir and Blueair, both of whom are often mentioned on this site.

But when it comes to overall economy and performance the top two are Allerair and Austin Air. Both of these companies offer no fancy frills air purification that emphasizes the essentials.

You’ll find high quality construction that maximizes HEPA performance combined with excellent chemical and odor control via activated carbon air purifiers. UV sterilization is also available as well as photocatalytic oxidation to further improve gas, odor and bacteriological control.

Allerair home air purifiers offer both HEPA filters and activated carbon filters with four to forty-eight pounds of activated carbon. Activated carbon air filter life is as long as 3 years. The HEPA filter replacements are recommended at three to five years, even eight years in the case of the AirMedic air purifier.

Typical HEPA filter cost for their most popular model, the 5000 Exec.. That comes to only 20 per year for each year of expected filter life.

All filters are easy to change without tools and can be replaced separately, which offers a cost savings over air cleaners that require you to replace both carbon and HEPA filters as one unit. There is even the option of replacing the carbon in bulk as opposed to a filter cartridge for further cost savings.

All are simple and no nonsense HEPA air cleaners. No filters cost more than and that is for the highly specialized MCS unit. Quoted prices reflect the cost of the HEPA filter only.

Austin Air manufactures good economy priced HEPA air purifiers that also provide VOC, gas and odor removal. Austin Air air purifiers concentrate on the essentials of air cleaning and are not loaded with fancy features.

A small drawback of the Austin Air models is they use a combined HEPA and gas phase filter comprised of activated carbon and zeolite. This means you have to replace both at the same time. However they are expected to last as long as five years and total cost is reasonable.

The typical cost of HEPA filter replacements for their most popular Healthmate model. That equates to only 36 per year for the combined HEPA and activated carbon air filter, which is quite reasonable. There are a number of specialized filters available at extra cost.

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Noise is one of the biggest complaints about air purifiers.

Are quiet HEPA air cleaners just not possible? Should noisy air cleaners be accepted as a necessary evil?

How can you make certain that your air purifier won’t be a source of noise pollution?

The secret to noise free air cleaning is really very simple.

Discover the Key to Quiet HEPA Air Cleaners

Regardless of the air purifier you buy, the real issue is not how loud it is on high but how loud it is on low. Higher settings are best used short-term to remove high levels of pollutants that occur occasionally, such as a kitchen mishap that fills your home with smoke.

Do not buy your air cleaner based on the maximum area it is rated to clean. An air purifier that can clean an 800 sq. ft. area can certainly handle 200 sq. ft. but with one important benefit. The smaller area can be cleaned on low or medium settings. These lower speeds are substantially quieter than an air purifier’s highest setting.

An air purifier on low will measure only about 30 to 35 decibels. This is lower than an average refrigerator and much lower than a soft conversation.

When making your air purifier choice, don’t make the mistake of buying too small a unit that must run on high to cover the area you need. Proper sizing of your HEPA air cleaner can mean almost silent air purification.

Most Recommended Quiet HEPA Air Cleaners

The Blueair air purifiers are a perfect choice for office, bedroom or anywhere truly quiet HEPA air cleaners are needed.

Blueair air purifiers are a top customer favorite due to their virtually silent operation. These quiet HEPA air cleaners are built around the patented HEPASilent filtration system.

Blueair’s HEPASilent filtration captures particles by combining electrostatics with a high efficiency filter. Electrostatic brushes inside the air purifier charge particles so they are attracted to the filter media while producing no ozone. Charged particles cling to the filter media yielding higher filter efficiency.

Air passes easily through the filter media so the fan doesn’t have to work as hard or as loud. Even the housing is made from noise muffling and highly durable galvanized steel.

When you want a small yet powerful air purifier that is ideally designed for clean air delivery and whisper-quiet operation, Blueair HEPA Air Purifiers are an excellent choice. The Blueair Air Purifiers feature outstanding Clean Air Delivery Rates (CADR). The larger 501 Blueair HEPA Air Purifier won Best of Class for CADR, as it delivered more clean air than similar air purifiers in its class.

Blueair’s quiet HEPA air cleaners are best suited for people who are looking for help with:

• Dust and Dust Mite Allergies
• Pet Allergies
• Pollen Allergies
• Mold Allergies
• Seasonal Allergies
• Asthma
• Healthy Home Environment

Benefits of Blueair HEPA Air Purifiers

• HEPASilent Blueair HEPA Air Purifiers achieve virtually silent operation.
• The 3-Stage Filter traps even the smallest particles. No pre-filter is necessary. The filters naturally resist contamination from bacteria, mold or viruses. The Filters are 100% recyclable.
• Easy to change filters: When the filter needs to be replaced (twice yearly), just open the lid, lift out the old filter and slide in the new one.
• Durable steel construction: The external parts are made of galvanized steel for durability. The powder coat finish produces no chemical out gassing
• Blueair HEPA Air Purifiers offer exceptional performance with environmentally friendly products. The Blueair HEPA Air Purifiers are energy efficient.