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The Honeywell FC40R1830 18x30 Return Air Grille Filter is a high efficiency, replacement air filter for return grille applications. Honeywell replacement furnace filters capture airborne particles that circulate through the furnace filter. This is a genuine Honeywell replacement air filter, not a generic compatible.
FC40R 1830 Honeywell Air Cleaner Specifications:
The FC40R Honeywell replacement filters features a special design that allows it to fit in the same space as a standard 1" return grille AC filter, while offering filtration up to forty times more effective (versus 1" fiberglass filters). This Honeywell filter also features a low pressure drop to reduce strain on your equipment. This furnace filter will clean your air down to 0.3 microns, trap dust, pet dander, pollen, mold, bacteria and other allergens.
The Honeywell FC40 Series replaces older model number F35R Series Filters and provides a high-efficiency alternative to 1 inch filters. This Honeywell return grille filter should be replaced at least once per year for maximum efficiency, depending on air quality.