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The fraction of particles removed from air passing through a filter is termed “filter efficiency” and is provided by the Minimum Efficiency Reporting Value (MERV) from an ASHRAE 52.2 test is based on the filter efficiency. - MERV ranges from 1 to 16; higher MERV = higher efficiency
a. Modifications were made to the MERV table to adjust the threshold for specific MERVs and allow for the 16 gradu-ations to be more observable in testing. b. To address user concerns about reproducibility and reli-ability of the test method, ASHRAE commissioned Research Project RP-1088, a comprehensive round robin of multiple
ASHRAE currently recommends using a minimum MERV 13 filter, which is at least 85% efficient at capturing particles in 1 µm to 3 µm size range. A MERV 14 filter is at least 90% efficient at capturing those same particles.
Do you know why HEPA filters are called ‘HEPA’? It’s actually based on the MERV rating. MERV stands for Minimum Efficiency Reporting Value. The rating was devised by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) to answer one question: Which air purifier is the most effective?
Minimum Efficiency Reporting Value, commonly known as MERV, is a measurement scale designed in 1987 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) to report the effectiveness of air filters in more detail than other ratings.
5 mar 2024 · The rating is derived from a test method developed by the American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) [see www.ashrae.org]. The higher the MERV rating the better the filter is at trapping specific types of particles.
14 gru 2020 · MERV ratings range from 1 to 20, with 1 being minimal filtration and 20 being the highest efficiency and maximum filtration on the scale. Ratings are determined by ANSI/ASHRAE Standard 52.2. Air filters work to remove particulate matter (PM) and other irritants from the air.
