20x20x4 MERV 8 Pleated AC Furnace Air Filters. 4 Pack

20x20x4 MERV 8 Pleated AC Furnace Air Filters. 4 Pack Actual Size: 19-1/2 x 19-1/2 x 3-3/4 | Nominal Size: 20x20x4 | Effectively captures and blocks small-particles such as dust, smog, lint, pet dander, dust mites, pollen and other small air particles. Filter Rating: MERV 8 | FPR 5-6 | MPR 600. Achieves MERV 8 pressure drop and air flow. Manufactured in the USA Improve indoor air quality and extend the service life of your HVAC system by replacing air filters regularly.