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The Honeywell FC40R1003 a high-efficiency, replacement filter for return grille applications. Designed to capture airborne particles that circulate through the filter. Nominal Dimension 20x20x4. Genuine Honeywell Part.
Honeywell FC40R1003 Specifications:
The FC40R features a special design that allows it to fit in the same space as a standard 1" return grille 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 Filters. This filter should be replaced at least once per year for maximum efficiency. Filter life based on air quality.