LiftMaster LM21XP Fire Door Release with Alarm Delay lm-hdsw24 Enhanced Safety: LED lights on

Enhanced Safety: LED lights on the arm increase visibility in low-light conditions

Compact storage in soft carrying case

allowing installers to transfer existing components as needed for faster replacement and reduced downtime

this part ensures long-term reliability in demanding vehicle access control systems

4 12V Batteries (8 Ah) for reliable battery backup

LiftMaster LM21XP Fire Door Release with Alarm Delay lm-hdsw24 Enhanced Safety: LED lights onProgrammable Fire Door Release for Rolling and Sliding Systems The LiftMaster LM21XP is a UL listed fire rated door release device designed for use with rolling steel, sliding, and center parting doors. Engineered to respond to fire alarms or fusible link activation, it enables controlled release of fire doors in emergencies while supporting compliance with NFPA 72 and 80. The unit features a normally energized fail safe design, programmable delay on