The Return Grille Filter provides a high efficiency, long life alternative to a 1" filter. Our patented design, unique to the industry, captures a significant amount of the airborne particles, in the air that circulates through the filter.

Features:

Mounts in most return filter grilles. Pleated for greater media capacity. Low pressure drop provides a comfortable air flow. Maintains equipment efficiency longer than standard filters. FC40 is MERV 10. FC20 is MERV 8. Efficiency Standard: Efficiency ratings are based on American Society of Heating, Refrigerating and Air-Conditioning Engineers Standard 52.2-1999.,Efficiency ranges are defined for small particles, E1=0.3 to 1.0 microns; medium particles, E2=1.0 to 3.0 microns; and large part. Fractional Efficiency: E1=31%, E2=61%, E3=86%.