Fire-Lite FM900 Electromagnetic Door Holder Extension Kit for FM Series

Keep fire and smoke barrier doors working reliably with the Fire-Lite Alarms by Honeywell FM900 Electromagnetic Door Holder Extension Kit. Designed specifically for FM Series holders, this extension kit gives installers the flexibility to mount the heavy-duty electromagnet on a wall or floor behind the door while the armature plate remains on the door — ideal for retrofits, odd angles, and constrained spaces. The kit supports 12V DC, 24V AC/DC, or 120V AC, preventing damage from incorrect voltage and simplifying wiring across facilities. With 25–40 lb of holding power, fail-safe operation that releases doors on power loss, and AC models protected against transients up to 600 volts, the FM900 delivers dependable performance for fire, security, and access control applications. Use it to integrate door holding with smoke detectors, monitoring systems, or building surveillance and alarm networks. Backed by a 2-year warranty and engineered for long service life, the FM900 extension kit reduces installation time and maintenance for facility managers and security professionals. Add the FM900 to your FM Series setup today to improve safety, compliance, and operational reliability.

• Extends FM Series door holder reach for flexible wall or floor installation, simplifying retrofits and odd-angle mounting
• Multi-voltage support (12V DC, 24V AC/DC, 120V AC) prevents damage from improper wiring and reduces installation errors
• Fail-safe design and 25–40 lb holding power ensure doors release reliably for life-safety and code-compliant operation
• Built-in transient protection (AC models up to 600V) protects electronics and enhances long-term reliability in critical security systems
• Positive release button for immediate manual door release and a 2-year warranty for dependable, low-maintenance operation