What is a filter’s MERV rating?
MERV stands for Minimum Efficiency Reporting Value. It is a number from a test method designed by the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE). The number is intended to help people compare filters. Generally speaking, a higher MERV indicates better filter performance. (i.e. a MERV 10 rated filter will offer superior filtration as compared to a MERV 8 rated filter and a MERV 8 is superior to MERV 6.) For optimum performance, be sure your media has a MERV 10 rating.
