换气扇的英文缩写为ventilator或exhaust fan。
双语例句：
1、提供了一种自动换气扇控制电路，具有自动向外抽烟，并向室内送入新鲜空气等功能。
This paper suggests a control circuit of automatic ventilator， which has automatic smoke extracting and fresh air taking in function.
2、全塑开敞式双向换气扇
Full-plastics open type bidirectional exhaust fa
