Please Measure Carefully! Other brands of 2x25x 5 filters may have different actual dimensions True Exact Dimensions are 19 5/8"x 24 3/16"x 4 15/16"- to replace old Reservepro #4501 and other brands with the same dimensions. Pack of 2 Filters- Higher Efficiency Merv 11...

Updated product- now ships in GREEN boxes and is Merv 11 GeneralAire 12758 For AC-1-#4001 General Filters AC-1 Replacement Air Filters -2-pack- replacement filter for General Aire air cleaner. 19 5/8" X 25" X 6". MERV 11 Rated OEM replacement for GeneralAire AC-1, AC22...