Liftmaster LM21AFCB Advance Fire Control Release Device lm-la400 The gear reducer steps down

The gear reducer steps down motor output speed to the torque level required to drive the swing gate arm assembly through its open and close cycle

Designed for both strength and reliability

and enhanced surge protection to ensure long-lasting

Fits versions without foot pedal release

this battery is designed to handle outdoor gate equipment and integrates smoothly with LiftMaster setups

Liftmaster LM21AFCB Advance Fire Control Release Device lm-la400 The gear reducer steps downAdvanced Fire Release Control for Motorized and Manual Door Systems The LiftMaster LM21AFCB is a UL listed fire control release device engineered to automatically close motorized or manual fire rated doors in the event of an alarm or power loss. Designed for dry indoor installations, the LM21AFCB offers programmable delay settings, auxiliary limit switch support, 3 cycle obstruction logic, and an integrated annunciator connection. It supports up to