Accumulair FC16X30_4 MERV 6 Rating Air Filter/Furnace Filters, 16x30x1 (15.5 x 29.5) - 4 pack MERV 6 Rating Economical, high-capacity media makes this filter an ideal upgrade from standard fiberglass throwaways. Each filter lasts up to 3 months. Captures a wide variety of airborne allergens including dust, mold, pet dander, and dust mites.