noun
air intake; ventilation opening
Technical term for an opening that lets air in, such as on a machine, building, or vehicle.
エアコンの風口から冷たい空気が出ている。
Cold air is coming out of the air conditioner's air intake.
車の風口に落ち葉が詰まっていた。
Leaves were clogged in the car's air intake.
Compound of 風 (kaza, 'wind') and 口 (kuchi, 'mouth, opening'). The reading かざぐち is a standard rendaku form.