18x18x1 air filters for your furnace, air conditioner, heat pump, or hvac system actual size (exact dimensions): 17.5 x 17.5 x 0.75 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
