Honeywell Silent Knight SD505-ADHR, Duct Detector Housing w/ Relay ModuleCondition:* New Surplus Stock, In OEM Packaging. As Pictured.Additional Notes:* The SD505-ADHR addressable duct smoke detector detects smoke and products of combustion present in air moving through an HVAC duct to prevent re-circulation of smoke into the air handling system. * The SD505-ADHR is a heavy duty metal housing with a pre-installed detector base and relay module. When smoke is detected in a duct, the unit communicates the condition to the IntelliKnight FACP. * The built-in relay module, in turn, turns off fans, blowers, and other devices. * Two-wire connection to SLC* LED alarm indication and communication on sensor head* Rugged steel backbox with clear plastic cover* Large terminal connection screws* Interchangeable “plug-in” photoelectric or ionization heads* Operates on 24 Volt AC/DC or 120/240 Volt AC* Current @ 24 Volt DC: Alarm: 75 mA Max. Standby: 35 mA Max.* SLC Current: Standby/Alarm: .082 mA* Alarm Relay: 10 Amp @ 24 Volt DC 10 Amp @ 120/240 Volt AC* Trouble Relay: 2.5 Amp @ 30VDC* Air Velocity: 500-4000 fpm SD505-APS 300-4000 fpm SD505-AIS* Sensitivity: 1.1 SD505-APS 0.8 SD505-AIS* Humidity: 10 to 85% RH* Ambient Temperature: 32F to 100F (0C to 37C)Silent Knight SD505-ADHR