The Kidde 439DEX-8AW-R is an 8-inch explosionproof fire alarm bell built for hazardous location installations where diode-supervised signaling is required. Heavy-duty construction with UL and ULC listings covers Class I, II, and III environments - a direct fit for petrochemical, industrial, and manufacturing facilities where standard notification appliances can't go.
Built for the hazardous location installer
The integral explosionproof housing accepts a standard 3/4-inch NPT conduit connection, tying into existing rigid conduit runs without adapters. Mounts to any solid surface with two 3/8-inch bolts and the included brackets, or directly to rigid conduit. At just 0.24A draw on a 24 VDC NAC circuit, it keeps device counts high on long wire runs - critical in large facility layouts where circuits stretch across multiple buildings or zones.
Key features
- Diode-polarized signaling: compatible with supervised NAC circuits requiring polarity-sensitive notification
- Explosionproof housing: UL and ULC listed for Class I Div 1-2 (Groups B, C, D), Class II Div 1-2 (Groups E, F, G), and Class III locations
- Low current draw: 0.24A at 24 VDC allows more devices per NAC circuit, reducing panel and power supply requirements
- 83 dBA at 10 ft: covers large hazardous areas with audible alarm notification
- Flexible mounting: surface mount with included brackets or direct conduit mount via standard 3/4"-14 NPT connection
- Wall or ceiling mount: orientation-flexible for facility layouts that demand it
System requirements
Requires a 24 VDC NAC circuit from a compatible fire alarm control panel (FACP). Conduit entry uses a standard 3/4"-14 NPT nipple (not included). For 120 VAC applications, see the 438DEX series.
What hazardous location classifications does this bell cover?
What voltage does this bell require?
How does this bell mount in a hazardous location?
Is this bell compatible with supervised NAC circuits?
What is the difference between the 438DEX and 439DEX series?
Spec Sheet
