The conditioned air is distributed throughout the cabin zones from ducting that runs up the forward right side of the fuselage to three supply ducts located above the passenger cabin ceiling. The air entered the cabin zones through aspirator units that are attached on the bottom side of the distribution ducting. This creates circulation of the air by mixing existing cabin air with the incoming conditioned air. The total volume of air in the cabin is changed approximately every 4 minutes. The cabin air then exhausts through grills in the sidewalls of the cabin floor venting down through the lower compartments before passing overboard through the pressurization outflow vales.
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