Filter Hut's alternative Honeywell FC40R1003 20x20 grille filter is engineered to fit existing return air grilles. Our grille filter is designed specifically to substitute for name brand Honeywell FC40R1003 grille air filter part number. This 20x20 Honeywell FC40R1003 return air filter replacements requires a minimum 3 7/8" duct depth. *Trade names are used for filter substitution identification purposes only.
- 20 x 20 x 4 nominal size.
- 19 3/4" x 19 3/4" x 3 3/4" actual size.
- Accumulair brand. Engineered to replace the name brand FC40R1003 grille air filter.
- Constructed to fit standard Honeywell model FC40R/
MERV graded to ASHRAE grades.
- 5 air grille filters in a case.