Model 3900 is a light-duty jackshaft operator for light-duty commercial sectional applications only. It features a compact design ideal for limited height, cathedral, or obstructed ceiling installations. It may be used on standard and high-lift (maximum 7 ft. high-lift) sectional doors measuring up to 14 ft. high and up to 18 ft. wide, but not exceeding 180 sq. ft. or 650 lbs.
