10x25x1 (9.5x24.5) MERV 8 Air Filter/Furnace Filters (6 pack) Nominal Size 10x25x1. Actual Size 9.5 x 24.5. MERV 8 Rated. Electrostatically charged filter. Great for helping reduce airborne allergens. Pack of 6 Filters. Each filter lasts up to 3 months under normal use. Proudly made in the USA.