RETURN GRILL MEDIA FILTER - 20 X 20 X 3. MERV 13.

- Dimensions (in.) 20 in. x 20 in. x 3 in. - Airflow Capacity (cfm)Maximum-- 1150 cfm - Airflow Capacity (m³/hr)Maximum-- 1950 m³/hr - Fractional EfficiencyE1=54%, E2=85%, E3=98% - Minimum Efficiency Reporting Value (Media Filters Only)MERV 13 - Static Pressure Drop (in. w.c.).177 at 295FPM - MERV 13 - Mounts in most return filter grilles. Provides high efficiency alternative to 1" filter. Features - Captures up to 85% of particles passing through the HVAC system - Three times the life of a standard one-inch filter under normal household conditions - Fits most one-inch ceiling or wall mount return grilles - Filtered air puts less strain on the heating and cooling equipment, allowing it to run more efficiently. High-Performance Return Grille Filters helps trap airborne dust, pollen, mold spores, bacteria and other allergens that pass through your HVAC system. It also lasts up to three times longer than standard one-inch filters, which mean less maintenance for improved indoor air quality.