The Simplex XAD Air-Sampling Smoke Detector is an excellent solution for challenging duct applications, as well as restricted areas such as prison cells and the top of elevator shafts when smoke detection is required by code. The system utilizes Simplex TrueAlarm® sensing technology, together with a high performance aspirator and configurable flow monitoring circuitry. It is well suited for use in traditionally difficult to access HVAC ducts, in commercial properties, institutional settings and industrial sites.