20x22-1/4x1 Filter

20 x 22-1/4 x 1" budget Fiberglass air filter for furnaces and central AC systems. Reduces dust and larger airborne debris such as pet dander and lint. Holds about 45 grams of dust per square foot. (Fractional efficiency of 3.4% against particles in the 0.7-1.0 micron range.) Lasts up to 30 days. 12 per box.