Analysis chamber for ventilation and air conditioning ducts. Venturi tube operating principle. Single air intake and exhaust pipe. Intelligent monitoring circuit that constantly controls and adjusts sensitivity for optimal functionality. IP65 protection rating. The device is equipped with a conventional detector, stand-alone operation, has an alarm relay and fault relay with changeover contact. Certified EN 54 27. Requires sampling tube TFTUBO-DUCT 60 or TFTUBO-DUCT 15.