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Features
The Liftmaster 3900 compact design ideal for limited height, cathedral, or obstructed ceiling installations. Wall mount installation - mounts on the left or right side of door and attaches to the door tension bar. Heavy-duty 24VDC motor provides ultra-quiet operation, along with variable speed smooth start and stop. No rails to hang, it simply mounts on the wall and attaches to the garage door torsion bar. By installing the optional EverCharge Standby Power System (sold separately), you can continue to operate your opener even when the power goes out. Security+ rolling code technology.
Specially designed for light-duty commercial sectional applications only. It may be used on standard, vertical, and 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. Maximum recommended duty cycle: 10 cycles per hour.
Includes: Liftmaster 3900 light-duty commercial jackshaft operator for sectional doors comes complete with a single APBS push button station, cable tension monitor, and The Protector System Safety Sensors. Quick-Connect Terminals, 6-foot power cord, owner's manual and installation instructions. Includes a Manufacturer's lifetime motor warranty and 5-year parts warranty.
Miscellaneous: Please contact if you would like us to forward you an installation manual prior to ordering. See our site for compatible remote control transmitters 371LM, 372LM, 373LM, 373P and 390LM. Also wireless keypad part #377LM and wireless fingerprint keypad part #379LM. Also purchase the EverCharge™ Standby Power System (475LM) for operating during power failure. Click here to download a FREE copy of the of the Liftmaster 3900 Owner's Manual.
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Good Economical Commercial Opener 
