17x21x1 air filters your furnace, air conditioner, heat pump, or HVAC system Actual size (exact dimensions): 17 x 21 x 1 inches (3-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
