有ゆう圧あつ換かん気き扇せん

noun

negative pressure ventilation fan; exhaust fan

Technical term used in building ventilation and HVAC contexts. Refers to a fan that creates negative pressure to exhaust air.

• この部屋へやには有ゆう圧あつ換かん気き扇せんが設せっ置ちされている。

  A negative pressure ventilation fan is installed in this room.