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Honeywell Filter - Grille Air Filter, Furnaces For: Nominal size 18" x 18" x 5" Actual size 17 3/4" x 17 3/4" x 3 3/4"
Honeywell Filter - Grille Air Filter, Furnaces For:Nominal size 18" x 18" x 5" Actual size 17 3/4" x 17 3/4" x 3 3/4"
After-Market Honeywel Filter - Grill Air Filter, Furnaces For:: FC40R1185 Nominal size 18" x 18" x 5" Actual size 17 3/4" x 17 3/4" x 4 3/8" Our MERV 11 and 13 are more efficient that the brand filters, and substantially less Note: We also offer the brand filter