These HEPA filters (111192, formerly F321) are the primary filters used in the Dri-Eaz DefendAir HEPA 500 Air Scrubber. These filters combine a powerful filtration ability with a remarkable filtration capacity. They are rated true HEPA-grade, removing 99.97% of micron oily aerosol particles down to 0.3 microns. Available in a pack of 2. To maximize HEPA filter life, be sure to change the prefilter (113364, formerly F271) regularly.

Dri-Eaz DefendAir HEPA 500 Filter Configurations

Your Filtration Needs	1st Stage Filtration (Pre-Filter position)	2nd Stage Filtration (Pre-Filter position)	Final Stage Filtration (Primary HEPA Filter)
Clean Water Loss Air Scrubbing	1st stage pre-filter not necessary	Install 2nd stage pre-filter (113364 / F271)	Install HEPA 500 filter cartridge (111192 / F321)
Standard Air Scrubbing	Install 1st stage pre-filter (115471 / F270)	Install 2nd stage pre-filter (113364 / F271)	Install HEPA 500 filter cartridge (111192 / F321)
"First Pass" Efficiency Air Scrubbing	Install 2nd stage pre-filter (113364 / F271)	Install DOP 2nd stage pre-filter (103724 / F415)	Install HEPA 500 filter cartridge (111192 / F321)
Air Scrubbing and Odor Control	Install activated carbon filter (100053 / F397)	Install 2nd stage pre-filter (113364 / F271)	Install HEPA 500 filter cartridge (111192 / F321)