Rabbit Air BioGS SPA-421a vs Rabbit Air BioGS SPA-582a

Both the Rabbit Air BioGS 421a and the Rabbit Air BioGS 582a home air purifiers are stellar units. Both will leave a room feeling fresher and healthier. Both offer superb features and low noise levels, while requiring almost no maintenance. But there are stark differences between the two that can make one better than the other for you.

CADR values & Room Size

The most notable difference is obvious right from their CADRs (Clean Air Delivery Rates). The SPA-582a rates at:

217 Pollen
197 Dust
188 Smoke

while the SPA-421a measures:

163 Pollen
145 Dust
144 Smoke

Those large differences do not mean that the SPA-582a cleans air better. But it does mean it will clean more air faster. One reason is the significant difference in the air volumes they can process. The SPA-582a pushes:

1 – 39 CFM
2 – 85 CFM
3 – 131 CFM
4 – 170 CFM
5 – 208 CFM

where the lowest number correlates with the lowest fan speed, the highest with the most powerful setting. By contrast, the SPA-421a can filter a more modest:

1 – 39 CFM
2 – 60 CFM
3 – 95 CFM
4 – 139 CFM
5 – 159 CFM

You can see that, above the lowest speed, the differences become considerable. Still, note that the lowest speed is the same rating and that the largest difference is at the highest speed.

Note, too, that the SPA-421a is designed for a room up to 600 sq. ft (about 24.5′ x 24.5′). The SPA-582a is built to handle one up to 780 sq. ft (just shy of 28′ x 28′).

4 Stage Filtration Systems

Both Rabbit Air air purifiers have essentially the same fine four-stage filtration system.

Stage 1 offers a pre-filter that removes the largest substances – pet hair, pollen, and larger dust grains. Stage 2 holds a HEPA filter that will strain out anything larger than 0.3 microns. The Charcoal Filter in Stage 3 will tackle smaller dust grains and many household VOCs (Volatile Organic Compounds).

The final stage deserves special mention. It’s an ozone-free negative ion generator that produces charged particles for the exhaust stream. Those float around, attaching themselves to many common household particles, making them heavier. The combination then floats to the ground to be vacuumed or filtered out by the home air purifier.

Modest Noise Levels

Each unit will perform that operation while producing very modest noise levels. The SPA-582a’s sound intensity ratings range from 19.1 dB (on low) to 49.1 dB (on the highest fan speed).

1 – 19.1 dBA
2 – 30.6 dBA
3 – 39.7 dBA
4 – 44.8 dBA
5 – 49.1 dBA

The SPA-421a is only a little quieter at 18.4 dB to 45.0 dB.

1 – 18.4 dBA
2 – 25.9 dBA
3 – 34.2 dBA
4 – 39.9 dBA
5 – 45.0 dBA

Conclusion

Price is an important factor, true. So, if your room is no larger than 600 square feet, the lower cost 421a may well be as good as the 582a in your circumstances.

But room size alone isn’t the only possible reason to spend the extra cash. If your room air gets more polluted than average – say, from living near a freeway or being exposed to high levels of dust or tree pollen – you may want to opt for the more powerful model. Also, some people are simply more sensitive than others and need the greater cleansing power.

With that in mind, it should be easy to choose between the Rabbit Air BioGS SPA-421a and the Rabbit Air BioGS SPA-582a. And, after all, with two such stellar models to choose from including a 5-year warranty on workmanship and materials, you really can’t go wrong.