The Notifier InnovairFlex D4120 and D4120W multi-voltage 4-wire photoelectric duct smoke detectors features a pivoting housing that fits various applications: both square and rectangular footprints and mounts to round or rectangular duct work.
The multi-voltage 4-wire design allows the D4120 and D4120W duct detectors to be used as a 4-wire device on a conventional fire detection system or as a stand-alone part of a HVAC system.
These units sense smoke in the most challenging conditions, operating in airflow speeds of 0.5 to 20.32 metres per second, temperatures of –20°C to 70°C, and a humidity range of 0 to 95 percent (non-condensing). A plug-in sensor head offers improved false alarm immunity and simple installation, testing, and maintenance. An improved cover design isolates the sensor head from the low-flow feature for simple maintenance.
The ST3 sampling tube is sold as a separate item ( not included in D4120 price )