LiftMaster LM21XP Fire Door Release with Alarm Delay lm-hdsw24 0 system to maintain optimal

0 system to maintain optimal operation and compliance

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

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

With its ability to support two ½ HP operators

LiftMaster LM21XP Fire Door Release with Alarm Delay lm-hdsw24 0 system to maintain optimalProgrammable 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