The Kidde 439D-10AW is a 10-inch vibrating fire alarm bell built for commercial and institutional notification circuits. Diode polarized for clean circuit supervision, it delivers 86 dB at 10 ft on 20-24 VDC - loud enough for corridors, warehouses, and mechanical rooms without adding complexity to the NAC loop.
Built for the commercial installer
The underdome design with heavy-duty mechanism mounts to standard single-gang or 4-inch octagonal boxes, wall or ceiling. The alloy steel gong handles the abuse of high-traffic commercial environments. UL Listed, FM Approved, and MEA Approved for broad jurisdictional acceptance. Add the 449 back box for outdoor or weatherproof installations.
Key features
- Diode polarized for supervised NAC circuit compatibility
- 86 dB at 10 ft per UL 464 - adequate coverage for commercial corridors and rooms
- Wall or ceiling mount on standard single-gang or 4" octagonal boxes
- Weatherproof capable with optional 449 outdoor back box
- UL Listed, FM Approved, MEA Approved for broad jurisdictional acceptance
- Alloy steel gong for durability in high-traffic commercial environments
System requirements
Requires 20-24 VDC from the fire alarm control panel NAC circuit. Mounts to standard single-gang or 4-inch octagonal electrical boxes. For outdoor installations, pair with the Kidde 449 weatherproof back box (ordered separately).
Does this bell work with supervised NAC circuits?
Can this bell be installed outdoors?
What electrical box does this mount to?
What voltage does this bell require?
Is this bell UL Listed?
Spec Sheet
