Simplex® air duct smoke detector housings provide a TrueAlarm smoke detector for monitoring air conditioning or ventilating ducts. Sampling tubes are installed into the duct allowing air to be directed to the smoke detector mounted in the housing. These duct detector housings with smoke detectors are compatible with Simplex fire alarm control panels that provide conventional two-wire or four-wire initiating device circuits (IDCs).

Includes factory installed TrueAlarm photoelectric smoke detector and features:
· On-board TrueAlarm sensitivity drift compensation and dirt accumulation tracking
· Multi-function status LED indicator
· Magnetic test that initiates an alarm and provides detailed diagnostic information
· Clear cover allowing visual inspection
· Test ports provide functional smoke testing access with cover in place
· UL listed to Standard 268A