The Filter Performance Rating (FPR) system is an exclusive rating system developed by Home Depot to measure the ability of an air filter to capture particles. It is a numerical scale from 4 to 10, in addition to a color coding system, that indicates what type of airborne contaminants each filter is ideal for capturing. Filters rated FPR 8-9 (best) are capable of filtering out large household particles, such as dust, lint, dust mites, larger pollen particles and pet dander. They also filter out small particles such as bacteria and mold spores, as well as smoke, smog, allergens and some particles that can transmit viruses.
The Minimum Efficiency Report Value (MERV) air filter rating system is the industry standard for comparing air filters. This is because there are different standards to meet, so you'll see some air filters with a MERV rating, while others appear as MPR or FPR. The following table explains the relationship between the numerical scales of the MERV rating system and the FPR system:When choosing an air filter for your home, it is important to select one with an appropriate rating based on your home conditions. If you have pets and allergies, a low-rated air filter won't do any good.
The FPR system can be useful for homeowners looking to change the brand of air filters or compare available options.