Abstract
The experiments, discharging the air downward from the nozzles arranged over the ceiling with equal distance, show that the air pattern remains symmetrical and, after the jets reach each other, rapid decreasing of the centerline air velocity is observed even the discharged air is cool. This is because most part of the flow rate along the jets turn back to be entrained to the jets again. This air-supply system therefore provides the uniform air distribution in the occupied space without excess air movement when the point where the jets reach each other is properly arranged.
