Refers to the movement or circulation of air, often in technical or everyday contexts such as room ventilation or airflow in machinery.
この部屋は通気が悪いので、窓を開けてください。
This room has poor ventilation, so please open the window.
I opened the window to improve the ventilation in the room.
Please do not block the machine's air vent.
If a closet has poor ventilation, mold tends to grow easily.
通風 highlights the natural passage or draft of air through a space, whereas 通気 is the more general technical term for airflow or ventilation.
密閉 means sealing something airtight so no air can pass, the opposite of 通気, which describes air freely moving through.
通期 (same reading) means 'the whole fiscal period' in business contexts, while 通気 refers to airflow or ventilation.
air vent; ventilation opening
air permeability; breathability
ventilation duct; air pipe
Compound of 通 (pass through) and 気 (air, spirit), literally 'passing air'. The exact historical derivation is uncertain, but the kanji combination directly conveys the meaning of ventilation.