24x24x4 10 & Furnace Filters. 6 Pack. Actual Size: 23-3/8 x 23-3/8 x 3-3/4

: Actual Size: 23-3/8 x 23-3/8 x 3-3/4 | Nominal Size: 24 x 24 x 4 10 Efficiency with 8 Air Flow (.25" ..) Electrostatic air filter for homes, business, schools, apartments, hotels and industrial. Durable and sturdy galvanized metal backing. Made in the . For optimal performance, recommended to change at least every 3 months.