APA151 | System Sensor | Gas & Specialty Sensors

Expand the versatility of the InnovairFlex line of duct smoke detectors with System Sensor notification and test accessories. APA151 piezo annunciators, which replace the APA451 with a new, improved look, provide an audible alarm signal, a red LED to indicate alarm status, and a green LED to indicate power status. They are intended for use with System Sensor 4-wire conventional duct smoke detector applications without a system control panel, to comply with NFPA 90 A.