American Air Filter 220-400-051 15" X 20" X 1" StrataDensity Fiberglass Air Filter (12 Pack)American Air Filter 220-400-051 15" X 20" X 1" StrataDensity Fiberglass Air Filter (12 Pack) Features:Disposable panel filters are engineered for sturdy, economical performance and ease of useConstructed with a strong, chipboard frame bonded to AAF manufactured premium grade fiberglass mediaUsed in all types of HVAC systems to protect the coils from dirtUse as prefilters to extend the life of higher efficiency filters15" x 20" x 1"