The Kidde 439D-6AW-R is a 6-inch vibrating fire alarm bell built for reliable audible notification on commercial fire alarm circuits. Running on 20-24 VDC with a low 0.085A draw, it operates directly off the panel's NAC without additional power supplies or special wiring considerations.
Built for the commercial installer
The underdome bell mechanism and alloy steel gong deliver 83 dB at 10 feet - loud enough to cut through typical commercial ambient noise. Diode polarized for supervised NAC compatibility. FM Approved and UL listed (S218, S2202) with MEA acceptance. Mounts to any standard single-gang box, 4" octagon, or 4" square box with the included mounting plate. For outdoor applications, add the optional Cat. No. 449 weatherproof back box.
Key features
- 83 dB at 10 ft from a heavy-duty alloy steel gong and vibrating mechanism
- Low current draw (0.085A) at 20-24 VDC - maximizes devices per NAC circuit
- Diode polarized for compatibility with supervised fire alarm circuits
- Mounts on standard single-gang, octagon, or square boxes - no special hardware needed
- Indoor/outdoor capable with optional Cat. No. 449 weatherproof back box
- FM Approved, UL listed for fire alarm applications
Mounting
Ships with a mounting plate that fits standard single-gang openings, 3-1/2" or 4" octagon boxes, and 4" square boxes. For weather-exposed locations, the Cat. No. 449 surface-mount weatherproof back box (sold separately) provides a sealed enclosure with gasket.
Can this bell be used outdoors?
Does this bell work on AC or DC power?
What mounting boxes does it fit?
Is this bell FM Approved?
What is the sound output?
How much current does it draw on the NAC?
Spec Sheet
