noun
diffuser; air supply outlet
Technical term in air-conditioning and ventilation systems. Refers to the outlet device that distributes conditioned air into a room.
天井の制気口から冷たい風が出ている。
Cold air is coming out of the ceiling diffuser.
制気口の位置を変えると空調の効率が上がる。
Changing the position of the air supply outlets improves air-conditioning efficiency.