20x20x4 air filters for your furnace, air conditioner, heat pump, or hvac system actual size (exact dimensions): 19.38 x 19.38 x 3.63 inches (4-pack) merv 13 electrostatic media (mpr 1900, fpr 10) protects against 98% 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
