The Honeywell FC40R1029 is a high-efficiency, replacement AC filter for return grille applications that will capture airborne particles such as the following:
This is a genuine Honeywell air conditioning filter.
Honeywell FC40R1029 Specifications:
The FC40R features a special design that allows it to fit in the same space as a standard 1 inch return grille filter, while offering filtration up to forty times more effective (versus 1 inch fiberglass AC filters).
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.