Supply PowerMaster model "MG" Industrial Duty Hoist
type operator rated for use on Sectional Doors with High Lift or
Vertical Lift and Rolling Service Doors and Grilles .
Primary speed reduction shall be by means of an
industrial gear box with bronze worm gear in an oil bath.
Motor shall be of the high starting torque, continuous
duty industrial type, protected from overload by a current
sensing or thermal type overload device. Motor controller
shall be a heavy duty, full voltage, across the line,
magnetic reversing contactor, that is mechanically and