Primary HEPA Filter Cartridge with Poly Prefilter, Cartridge Only

Primary H.E.P.A. cartridge filter, with 2 ply polyester prefilter, plus reusable top and bottom cover fittings. HEPA offers 99.97% efficiency using thermally generated dioctylphthalate (DOP), with particles .3 micron or larger in size as the challenge. Prefilter provides 30, 35% efficiency based on ASHRAE 52 Test Method. For use with SP-981-2A or SP-981-2B portable systems. Filter & Filter Fittings for the Extract-All® Air Cleaner Fume Extractor S-981-2B and SP-981-2B: Primary H.E.P.A. cartridge filter, with 2 ply polyester prefilter, plus reusable top and bottom cover fittings. HEPA offers 99.97% efficiency using thermally generated dioctylphthalate (DOP), with particles .3 micron or larger in size as the challenge. Prefilter provides 30, 35% efficiency based on ASHRAE 52 Test Method.