What Are MERV Ratings?
MERV — Minimum Efficiency Reporting Value — is a standardized numerical scale that measures how effectively an air filter captures airborne particles. Created in 1987 by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE), it is formally defined under ANSI/ASHRAE Standard 52.2, the global benchmark for HVAC filter testing. The scale runs from…