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Gives the DefendAir® HEPA 500 first-pass filtration efficiency

DOP stands for "Dispersed Oil Particulate," the name of a standard procedure for testing the effectiveness of HEPA filtration. The DOP test introduces an 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.

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.

Product Features

  • 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.
  • Install the DOP filter between the standard pre-filter and the HEPA primary filter.


Multiple filter options for expanded applications and versatility

The Defendair HEPA 500 may be set up in a variety of filter configurations to suit your particular air scrubbing requirements. Use the chart below to find the best filtering configuration for the job at hand. 

Filtering Application First filter position Second filter position Final filter (HEPA)
Clean water loss air scrubbing. For a relatively clean environment. (no filter necessary) 2nd Stage Pre-Filter (F271 orAC36F2) HEPA filter (F321)
Standard air scrubbing. For environments with higher particle loads, such as construction or remodeling sites. 1st Stage Pre-Filter (F270) 2nd Stage Pre-Filter (F271 orAC36F2) HEPA filter (F321)
First pass efficiency air filtration. For use with a negative air setup during remediation of high risk contaminants and/or when DOP testing is required. (no filter necessary) DOP Pre-Filter (F415) HEPA filter (F321)
Odor control and air filtration. For the removal volatile organic compounds (VOCs), food odors, fumes from paint and paint thinners, sewer odors, and many other noxious odors. Activated Carbon Filter (F397) or OdorKlenz Air (AR70)  2nd Stage Pre-Filter (F271 orAC36F2) HEPA filter (F321)


Filter Descriptions

  • 1st Stage Pre-Filter (F270). Synthetic fiber filter media rated at 10% efficiency. Captures the largest particles to help extend the life of the higher efficiency filters inside. More info.
  • 2nd Stage Pre-Filter (F271 or AC36F2). Synthetic fiber filter media rated at 30% efficiency. Captures larger particles to help extend the life of the HEPA filter. More info.
  • DOP Stage 2 Pre-Filter (F415). Use of the DOP filter ensures laboratory-rated performance for sensitive jobs requiring first-pass HEPA filtration. More info.
  • Activated Carbon Filter (F397). The activated carbon filter allows the removal of a wide variety of compounds, including volatile organic compounds (VOCs), food odors, fumes from paint and paint thinners, sewer odors, and many other noxious odors. Combining activated carbon filtration with HEPA filtration is especially effective in removing airborne soot particles and the odors they create. More info
  • OdorKlenz-Air® (AR70) is a non-invasive odor restoration process used by restoration contractors after fires, floods, sewer back-ups, and other disasters to rapidly restore indoor air quality. The OdorKlenz-Air Cartridge installs in portable air scrubbers and treats the odor-polluted air as it passes through the system. Since the process removes and destructively absorbs airborne odor-causing molecules and retains them inside the cartridge, it is safer and greener than other odor treatment methods which generate or release chemicals and fragrances into the environment. 
  • HEPA filter (F321). The HEPA filter has an efficiency rating of 99.97% against 0.3 micron oily aerosol particles. The HEPA filtration standard was developed in the 1940s to control radioactive dust particles in U.S. nuclear laboratories. More info.



SKU F415
Brand Dri-eaz
Shipping Weight 2.0000kg
Shipping Width 0.030m
Shipping Height 0.450m
Shipping Length 0.450m
Shipping Cubic 0.006075m3
Unit Of Measure Each