18x18x4 Honeywell FC40R1185 MERV 10 Aftermarket Replacement FilterHWR18184 $127.16 SKU: HWR18184 Back $127.16 Quantity -+ Add to Cart Details 18x18x4 Honeywell FC40R1185 MERV 10 Aftermarket Replacement Filter DetailsBackDetails18x18x4 Honeywell FC40R1185 MERV 10 Aftermarket Replacement FilterSee MoreSee Less