Commercial Door Opener Trolley Max Door Height (Ft.) 14 Max Door Width (Ft.) 22 Motor Type Medium Duty Motor HP 1/2 Voltage 115 A Safe and Easy Way to Operate Commercial and Residential Garage Doors Reversal System Internal Auxiliary Helps Prevent Door and Opener Damage and Operator Injury if an Obstruction is Hit Radio Receiver - Rated for 12 Cycles Per Hour This Opener Features a Solid Double L Rail thats Designed to Handle Heavier Doors and Allows Quick Installation Standards -