Description
Actual Size: 17.75 x 23.75 x 4.38. This (Accumulair brand) 18x24 Honeywell FC40R1136 style return air grille filter is exactly engineered to be compatible with the original FC40R1136 return air filter style. No assembly needed. Note: The example filter image displayed is not to scale and is shown for lip configuration purposes. *Brand names and FC40R1136 part number are listed for air filter substitution purposes only. Current stock and FC40R1136 statements are up to date as of 10/24/2025.