Interchangeable With International, Jackson, and Similar Brands of Overhead Concealed Closers Adjustable Spring power Range of 8-1/2 Pounds to Medium Spring Size Suitable for Doors From 36" to 48" (914 to 1219 mm) to meet A.D.A. Opening Force Requirements 5 Year Limited Warranty and UL Listed The CRL Adjustable Spring Power Overhead Concealed Door Closer is available to meet Federal A.D.A. Opening Force requirements.