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Top view of ceiling diffusers in HVAC cases. Air enters parallel to the ceiling from the sides of each square diffuser. There are eight diffusers in total, spaced 1.8 m apart. The initial velocity of air across the inlets is 0.5 m/, resulting in 0.343 kg/s of fresh air entering the room. A square return vent is present on one side wall, which acts as a pressure boundary at gauge pressure.
