18x30x1 Lifetime Air Filter Electrostatic A/C Furnace Air Filter Silver 94% Arrestance. Lifetime Warranty. Never Buy a New Filter

A special impregnated black polypropylene has an EPA registered anti-microbial material to inhibit mold and bacteria growth while the center, non-woven layer retains debris in a maze of fibers designed to maximize air flow even when soiled. Rated by independent testing laboratory at over 94% peak arrestance (particle filtering efficiency), this filter has 10 times the filtering capabilities of a disposable fiberglass filter.Highest filtering efficiency available for the majority of furnaces and air conditioners