Honeywell FC40 Return Grille Media Air Filters feature a special design that allows it to fit in the same space as a standard 1" return grille, while offering filtration up to 15 times more effective than a standard 1" fiberglass furnace filter. Honeywell's return grille filter is a perfect fit for most 1" residential return grilles - either ceiling or wall mount. Filter air flowing through your return to trap dust, pet dander, pollen, mold spores, bacteria and other allergens in your home for up to one year without replacement.

Honeywell FC40 Return Grille Media Filter