LiftMaster LM21XP Fire Door Release with Alarm Delay lm-hdsw24 Two-Button Design: Manage multiple access

Two-Button Design: Manage multiple access points

Component Type: Reversing contactor

Ensures smooth

Compact storage in soft carrying case

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

LiftMaster LM21XP Fire Door Release with Alarm Delay lm-hdsw24 Two-Button Design: Manage multiple accessProgrammable 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