What is the difference between MERV, MPR, and FPR ratings? When shopping for air filters for your home, you may have come across these letters and may have found yourself asking the following questions: What is a MERV rating? What does MERV stand for? What does MPR rating on air filters stand for? What does FPR rating mean? MERV and FPR what is the … [Read more...] about What’s the Difference between MERV, MPR and FPR?