Filterbuy 18x21x1 MERV 8 Pleated HVAC AC Furnace Air Filters (4-Pack)

18x21x1 air filters for your furnace, air conditioner, heat pump, or HVAC system Actual size (exact dimensions): 18 x 21 x 1 inches (4-Pack) MERV 8 electrostatic media (MPR 600, FPR 5) protects against 90% of particles Pleated design traps more airborne particles and lasts 3x longer than fiberglass All industrial-grade components are made in the USA and designed to be recycled