Austin Air HEPA Filter	Four Layers of Revolutionary Protection A large outer filter traps the large airborne particles, lint and pet hair. The pre-filter (Permafilt™) traps smaller particles that have passed through the outer filter. These initial layers add life to the carbon and HEPA layers. 15 lbs. of activated carbon adsorbs still smaller particulate as well as odors and gasses. Finally, True Medical HEPA filter paper removes harmful airborne particles as small as 0.3 microns.
Austin Air SuperBlend Filter	Impregnated with Potassium Iodide for adsorption of more odors and gases The SuperBlend filter is specifically designed for the Chemically Sensitive Along with all of the protection of the Standard HEPA filter, the carbon/zeolite in the SuperBlend has been specially treated with potassium iodide - a special compound that enhances the adsorbtion of thousands of odors and gases