Abstract: An injector air outlet includes a temperature sensor and a smoke sensor to simultaneously carry out the functions of air recirculation and temperature and smoke monitoring within a closed interior space, such as a passenger cabin or a freight or cargo hold in an aircraft. The injector air outlet includes a housing wall (2) with an injector mixing chamber (3) therein. A primary supply air inlet (4) receives primary supply air (5) from the aircraft's air distribution duct network, and blows the primary supply air through an injection nozzle (7) into the mixing chamber (3) so as to create a reduced or negative pressure in the mixing chamber. Cabin exhaust air (10) is sucked through a secondary air inlet (9) and a secondary air channel (8) into the mixing chamber (3), due to the reduced pressure or suction effect therein. The primary air and secondary air are mixed together and then ejected forcefully back into the cabin or cargo hold.

Abstract: The climate in one or more aircraft cabin zones is controlled to achieve a minimal use of fresh air and an optimal use of recirculation air while satisfying official regulation requirements and avoiding freeze-ups in the air duct system of commercial aircraft. For this purpose temperature sensors ascertain a plurality of different actual temperature informations at different locations in the air supply system. Valve position sensors provide actual flow volume information from one or more valve locations. An r.p.m., volumetric flow or differential pressure sensor provides actual blower r.p.m., volumetric flow or differential pressure information. A CPU compares the actual information with rated information stored in a memory or entered through a keyboard to provide control signals, including closed loop control and/or open loop control signals, to a blower or blowers, a valve or valves, and to at least one air conditioner.