Dri-Eaz DOP Stage 2 HEPA 500 Pre-Filter (F415) - 4 Pack

The addition of the DOP filter makes the DefendAir HEPA 500 a high efficiency three-stage air filtration unit. 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.

Part # 103724

DOP stands for Dispersed Oil Particulate,the name of a standard procedure for testing the effectiveness of HEPA filtration. The DOP test introduces a dense cloud of extremely fine particulates into the filter under controlled conditions. DOP testing is often conducted in specific types of stringent air quality control job sites that require first-pass HEPA filtration.

• Install the filter between the standard pre-filter and the HEPA primary filter.
• For highly effective odor removal, use the Activated Carbon Filter together with the DOP filter. Simply replace the paper pre-filter with the carbon filter.
• Passes Laboratory DOP testing when installed as part of three-stage filtration process.
• Equips the HEPA 500 for a wide range of environments that require first-pass high efficiency air filtration.