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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
The Honeywell FC40R1078 Return Air Grille Filter is a high efficiency, replacement AC filter for return grille applications. Designed to capture airborne particles that circulate through the filter. Nominal Dimension 24x24x4. This is a genuine Honeywell air conditioning filter.
Honeywell FC40R 1078 Specifications:
The FC40R features a special design that allows it to fit in the same space as a standard 1" return grille A/C filter, while offering filtration up to forty times more effective (versus 1" fiberglass filters). This filter will clean your air down to 0.3 microns, trap dust, pet dander, pollen, mold, bacteria and other allergens.
The Honeywell FC4 Series replaces older model number F35R Series airconditioning filters and provide a high-efficiency alternative to 1 inch filters. This filter should be replaced at least once per year for maximum efficiency. Filter life based on air quality.