noun
air inlet; intake vent
Technical term for an opening through which air is drawn into a system, such as in engines, ventilation, or HVAC equipment.
エンジンの吸気口にゴミが詰まっていた。
The engine's air inlet was clogged with debris.
換気システムの吸気口は定期的に掃除が必要だ。
The intake vent of the ventilation system needs regular cleaning.
吸入口 is a more general term for any suction inlet, often used for liquids or gases; 吸気口 specifically refers to air intake.
Compound of 吸気 (kyūki, 'air intake') + 口 (kō, 'opening').