Designed for use on standard, high and vertical lift sectional doors or rolling doors and grilles. Can be wall, hood or shelf mounted on either side of the door. It incorporates a floor-level disconnect mechanism for manual operation. Features: Motor-1/2 HP; 120V single phase intermittent-duty motor with instant reverse and internal automatic reset thermal overload protection. Drive-41# roller chain with 41B12 sprocket on operator drive shaft. 14 cycles/hour; 50 cycles/day