通风扇是利用空气对流、负压换气的降温原理，由扇叶和电机组成。
储罐装备有紫外灯和通风扇。
Tanks are equipped with functional U. V. lights and ventilation fans.
如机箱通风扇提供的气流达不到要求，则备用通风扇将启动。
A backup ventilation fan activates if the enclosure ventilation fan does not achieve required air flow.
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.
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