Translation guide
A ventilator is a machine that helps people breathe. In Japanese, the term depends on whether you mean a medical ventilator or a general ventilation device.
medical ventilator
ventilation fan
A machine that moves breathable air into and out of the lungs for a patient who cannot breathe adequately.
Standard term for a medical ventilator. Literally 'artificial respiration device'.
The patient is on a ventilator.
Loanword from English, used in medical contexts. Often interchangeable with 人工呼吸器.
Please check the ventilator settings.
Less common loanword; may be understood but 人工呼吸器 or レスピレーター are preferred.
A ventilator is needed.
A device that circulates fresh air or removes stale air from a room or building.
Using 換気扇 for a medical ventilator would be incorrect and potentially dangerous in a medical context. Always clarify whether you mean life support or air circulation.
This building is equipped with a ventilation system.
通風機を回してください。
Please turn on the ventilator.