Air Filter Rating Systems Explained
WHAT IS A MERV RATING?
MERV standings for Minimum Efficiency Reporting Value. It is the rating system that is the most commonly used system established by the American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE). MERV Ratings use a number from 1-20 to measure the effectiveness of a filter at trapping and stopping airborne contaminants and particles. 1 being the lowest level of filtration, and 20 being the highest. Most homes and office buildings use filters with a MERV 6-13 rating. Hospitals, clean rooms, and powerplants typically use a higher level MERV rated filter.
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