Air purifiers are designed to remove airborne particles, such as dust, pollen, mold, and bacteria, from the air. To achieve a high CADR rating, air purifiers typically use a high efficiency particulate air (HEPA) filter. This type of filter can theoretically remove at least 99.97% of any airborne particles with a size of 0.3 microns (µm).However, air purifiers can only remove allergens when they are floating in the air. Testing has shown that any purifier of the right size will distribute filtered air evenly, in the farthest corner of a room.
Air cleaning can be useful when used in conjunction with source control and ventilation, but it does not replace either method. DustMagnet machines can also be used as a small side table, because air comes out of the machine horizontally rather than vertically as in most purifiers. This can lead to dangerous indoor air quality, and CR does not recommend this type of air purifiers. The Dyson Pure Hot+Cool HP04, which incorporates a heater and purifier, should in theory have worked somewhat better than the TP04 because it can move a slightly larger volume of air. If you want a basic smart air purifier, it's an attractive option, as it connects with Amazon Alexa and Google Assistant for voice control, as well as having its own app. Another Winix, the AM90, uses the same HEPA filter as the 5500-2 and offers almost identical performance in our tests. Ozone generating air purifiers are devices that purposely create ozone to clean the air through chemical interactions that alter the compounds of pollutants, but this is also the mechanism by which ozone exerts harmful health effects. In conclusion, HEPA filters are the most common type of filter used in air purifiers.
They are designed to remove airborne particles from the air and can theoretically remove at least 99.97% of any airborne particles with a size of 0.3 microns (µm). However, it is important to note that air purifiers can only remove allergens when they are floating in the air and should not be used as a replacement for source control and ventilation.
