The alternative Honeywell FC40R1185 18x18 return air grille filter is designed to fit standard grilles. Our return air filter is designed specifically to replace the OEM Honeywell FC40R1185 return grille air filter part number. The 18x18 Honeywell FC40R1185 air grille filter replacements requires a minimum 3 7/8" duct depth. *Brand names are used for air filter substitution identification purposes only.
- 18 x 18 x 8 nominal size.
- 17 3/4" x 17 3/4" x 3 3/4" actual size.
- Accumulair brand. Specifically designed to substitute for the original manufacturer FC40R1185 grille air filter.
- Constructed to fit standard Honeywell model FC40R/
MERV rated to ASHRAE classifications.
- 5 return grille air filters per case.