Overhead Door- Aluminum Door Systems Model 521

Overhead Door- Aluminum Door Systems Model 521 – is perfect for environments where maximum light infiltration and/or visual access is required. Designed to fit openings up to 26’2” (7976 mm) wide and 20’1” (6121 mm) high, the 521 Model features a wide, 2 11/16” (68 mm) center stile, a 2 3/8” (60 mm) or 3 3/4” (95 mm) top rail, and 3 3/4” (95 mm) or 4 1/2” (114 mm) bottom rail. A variety of glazing choices, finishes and special options are available.