High Efficiency Particulate Air (HEPA) Filters

By definition, HEPA filters are at least 99.97% efficient at filtering 0.3 μm mass median diameter (MMD) particles in standard tests.

Filters with MERV ≥13 (or ISO ePM1) are efficient at capturing airborne viruses but HEPA filter efficiency is higher than MERV 16 which is even more effective in removing particles.

It is usually not feasible to retrofit existing HVAC systems with HEPA filters due to high pressure drops and the likelihood that systems will need new filter racks to allow sufficient sealing to prevent filter bypass.

Adding HEPA filters to systems that are not designed for them may cause significant damage.

HEPA filters are often delicate and require careful handling to prevent damage and preserve performance.

HEPA filters can be located in HVAC systems or in:

        – In-Room or Portable HEPA Air Cleaners

        – Pre-Assembled Systems (e.g., Side stream bypass systems)

        – On-site Retrofit Assemblies

Our Absolute air purifier is equipped with a High efficiency HEPA 13 filter which is best known to trap airborne allergens.


  1. A study finds that HEPA filters reduce cardiovascular health risks associated with air pollution.

               Reference: https://www.sciencedaily.com/releases/2011/01/110121144009.htm

  • Use of air cleaners and filters are one of the suggested strategies to improve indoor air quality.

Reference: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4587002/

  • A 2010 analysis by the academy concluded that “the principal role of air cleaning and filtration in the living environment for those with allergic respiratory diseases might relate more toward the reduction of disease progression rather than a ‘treatment.

Reference: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2824428/

  • A study conducted a Performance analysis of portable HEPA filters and temporary plastic anterooms on the spread of surrogate coronavirus. Results showed that HEPA machine effectively removed particles from the isolation space.

Reference: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7424318/