Abstract: A ventilation system for clearing gaseous and particulate contaminants such as cigarette smoke and metabolic exhalants from an aircraft cabin. The ventilation system is disclosed in two embodiments, the first having an overhead discharge duct (84) through which supply air is provided to the interior of the cabin (12) and discharge nozzles (78) disposed adjacent the lower portion of the inwardly extending end of storage bins (20) through which supply air is discharged toward the sidewalls (14) of the cabin. Air is exhausted from the cabin through exhaust air ducts (40) disposed immediately below the point where the storage bins attach to the sidewalls. In addition, air is recirculated from the cabin through recirculation air ducts (30) disposed adjacent the floor of the cabin. Relatively contaminated air is thus swept by the supply airflow directly into the exhaust air ducts for venting outside the aircraft, while cleaner air is recirculated back to the supply air ducts for ventilation of the cabin.

Abstract: An aircraft cabin air conditioning system with an air mixing/water separation manifold providing accelerated mixing and attendant removal of water droplets, ice and snow so as to save fuel and to reduce maintenance requirements through lowering the temperature and reducing the supply rate of fresh input ventilation/pressurization air with make-ups of ventilation air requirements met by recirculation of cabin air through the manifold where such mixing and water removal occurs.

Abstract: A relief valve has a pair of poppet valves mounted to seal against each other when in the closed position and to uniformly move apart when opening to place one of the poppet valves outside configuration on an aircraft to create a ram air effect through the opened valve.