換気扇 is a compound: 換気 (ventilation) + 扇 (fan).
Common locations
- 台所の換気扇 (kitchen exhaust fan)
- 浴室の換気扇 (bathroom exhaust fan)
- トイレの換気扇 (toilet exhaust fan)
Common collocations
Cultural note
Kitchen exhaust fans in Japan commonly get very greasy and require regular cleaning. Many people clean them during 大掃除 (year-end cleaning).