The Home Depot Air Filter Performance Rating System, tested by an independent third-party lab, measured all brands of air filters we sell by measuring: 1) ability to capture large particles, 2) ability to capture small particles, 3) and weight gain (filter lifetime). The results of this testing were weighted in a scale as follows:
Large Particle Capture: 60%
Small Particle Capture: 30%
Weight Gain/Lifetime: 10%
The Home Depot Air Filter Performance Rating System created a weighted average for each filter, which was then ranked on a 1 – 10 scale: one being the lowest performance, and 10 being the highest performance air filter. This scale takes the guess work out of choosing the best air filter for your home, depending on your needs. In addition to the number, rating ranges have been assigned their own color and descriptor: Premium (10) is black, Best (8-9) is purple, Better (6-7) is red and Good (4-5) is green. This new system makes it simple to compare and select the best air filter for you. High efficiency air filters in particular are a cost-effective way to help improve indoor air quality which may be beneficial to family members sensitive to allergens and other particles that may be found in the air in your home. Air filters also help keep your furnace’s coils and heat exchangers clean which may prolong furnace life and help keep it running efficiently.