How do HEPA air purifiers work?
The inlet grill draws in dirty air. In most HEPA air purifiers, a washable pre-filter traps larger particles. By definition, a HEPA filter removes at least 99.97% of all particles as small as 0.3 microns. HEPA air purifiers were originally developed by the Atomic Energy Commission to capture radioactive dust particles. Allergens such as pollen, animal dander, mold spores, and dust get trapped in the filter. Many HEPA air purifiers also contain a carbon filter to capture chemicals, odors, and gases. Once the dirty air is purified, a fan sends it back into the room as clean air.

What is a micron?
Air purifiers are designed to eliminate impurities in the air—even those impurities which are so microscopic that they are invisible to the naked eye.
Microns are used to measure the size of these microscopic airborne particles. Microns are used to measure airborne particle sizes. One micron is 1/25,000 of an inch. To give you an idea of how small this is, dust mites average around 300 microns, and a grain of sand can be over 800 microns!

What is a HEGA filter?
HEGA stands for High Efficiency Gas Absorption. These types of filters, made from military carbon cloth, are specific to certain Austin Air models, such as the Austin Air Allergy Machine. The Oxynet Air Purifiers use a HyperHEPA filter, which has more capacity and a longer life.
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