通风扇 
ventilating fan
[电] vent fan
- 储罐装备有紫外灯和通风扇。
Tanks are equipped with functional U. V. lights and ventilation fans. - 冬天将门窗、门、墙壁空调和通风扇安装孔等加以绝热密封可以节省供热能量。
You can cut your energy consumptions by installing good quality insulation of windows and doors in the winter.