The Kidde 439D-10AW-R is a 10-inch red fire alarm vibrating bell built for commercial and industrial notification circuits. Diode polarized for compatibility with coded NAC systems, it delivers 95 dB at 1 meter - loud enough to cut through warehouse floors, mechanical rooms, and open commercial spaces where audible notification is non-negotiable.
Built for the commercial installer
Alloy steel gong construction handles the abuse of high-traffic and industrial environments. FM Approved and UL Listed (S218, S2202), with MEA acceptance for New York City installations. The mounting plate fits a standard single-gang opening and accepts surface mounting, 3-1/2" or 4" octagon boxes, 4" square boxes, or the Kidde Cat. No. 449 weatherproof back box for outdoor applications.
Key features
- 95 dB at 1 meter (85 dB at 10 feet) for reliable audible notification in large commercial spaces
- Diode polarized for coded notification appliance circuit compatibility
- Indoor/outdoor rated when paired with Cat. No. 449 weatherproof back box
- Alloy steel gong with heavy-duty underdome mechanism for long-term reliability
- Standard single-gang mounting plate fits octagon, square, or surface-mount configurations
- FM Approved, UL Listed, MEA Approved for code-compliant installations nationwide
Mounting options
Wall or ceiling mount. Accepts surface mounting or installs on 3-1/2" octagon, 4" octagon, 4" square boxes, or the Kidde Cat. No. 449 weatherproof wall box for exterior applications.
Can this bell be used outdoors?
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Is this bell FM Approved and UL Listed?
Spec Sheet
