Minimum Efficiency Reporting Value, or MERV for short, is a filter rating system devised by ASHRAE, the American Society of Heating, Refrigeration and Air Conditioning Engineers, to standardize and simplify air filter efficiency ratings for the public. The higher the MERV rating, the higher the effectiveness of the air filter. Simply stated, a MERV 13 filter will remove smaller particles from the air than a MERV 8 filter.
MERV ratings allow you to effectively compare one type or brand of filter to another. For example, the EPA guidance for indoor air quality in schools recommends filters between MERV 8 and MERV 13. By comparison, the typical fiberglass throwaway filter used in most homes has a rating of MERV 4 or less. If allergies or asthma are your concern, we suggest you choose a MERV 8 filter at minimum.
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