It fits Carrier/Bryant Infinity air cleaner model Gapaaxcc1625. Nominal size is 16 x 25 x 3 1/2 (Actual Size 17 1/16 x 24 3/8 x 3 5/8). This filter usually needs to be changed once per year under normal conditions. This product is listed and rated by Underwriters Laboratories as U.l. Class 2. Note: All Carrier/Bryant Infinity filters are interchangeable.