GeneralAire 4001 AC1 High Efficiency Expandable Media Air Filter (# 12758)

AC1 High Efficiency Expandable Media is a high efficiency filtering media that is extremely durable. Pending the operation of the heating or cooling systems, the replacement media filter should last from one to two years in duration. This filter has one of the highest MERV ratings in the HVAC indsutry, keeping out allergies, dust, mold, bacteria, spores, and pet dander.  Fits: GeneralAire® AC1, AC22. Fits: Bryant 902BX; Carrier 31MF020, 31MF120; Source 1 S1-MAC11202506, S1-FM11202506.