12x18x4 air filters for your furnace, air conditioner, heat pump, or HVAC system Actual size (exact dimensions): 11.75 x 17.75 x 3.75 inches (4-Pack) MERV 11 electrostatic media (MPR 1200, FPR 7) protects against 95% 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
