Dri-Eaz DOP Pre-filter for HEPA 500, each

DOP Stage 2 HEPA 500 Pre-Filter
Gives the DefendAir® HEPA 500 first-pass filtration efficiency

The addition of the DOP filter makes the DefendAir HEPA 500 a high efficiency three-stage air filtration unit, ready for any sensitive job requiring first-pass HEPA filtration. With the standard pre-filter, DOP Stage 2 pre-filter and the HEPA primary filter installed, the HEPA 500 passes laboratory DOP testing conducted per ANSI standards, achieving an efficiency rating of 99.97% against oily aerosol particles down to 0.3 microns.

16" x 16" x 1" DOP Pre-Filter for HEPA 500. Each, 4 per pack

This is NOT the replacement HEPA for the Dri-Eaz 500, see https://www.sycorp.ca/abatement/filters-and-vacuum...