MPR 1550 is equal to MERV Rating 11 MPR 1900 is equal to MERV Rating 11 MPR 2200 is equal to MERV Rating 13 MPR 2800 is equal to MERV Rating 13 FPR, MPR, and MERV Air Filter Rating FAQs What does MERV stand for in air filter ratings? What does FPR stand for in air filter ratings?