When radon ventilation fans are added radon levels can even be reduced further.
当增加氡换气扇时，可进一步降低氡的水平。
Even powerful ventilation fans don't effectively remove secondhand smoke from the air.
看似功效强大的通风设备并不能有效清除二手烟。
What is more, tunnels need power for lights and ventilation fans, and to run pumps when they flood, whereas Bridges require almost none.
除此之外，隧道需要电能来为隧道里的灯光与通风扇供电，还需要在隧道被淹的时候使用水泵，而桥梁则不需要这些。
Tanks are equipped with functional U. V. lights and ventilation fans.
储罐装备有紫外灯和通风扇。
Minimize your use of ventilation fans such as bathroom fans and kitchen hood fans in winter.
冬天尽量减少通风机的使用，比如浴室换气扇和厨房油烟机。
On the basis of analyses and researches, this paper derives a method to measure the air leakage ratio within the last 100m ventilation pipe and the air volume to be provided by the ventilation fans.
并通过分析研究，推导出末段百米漏风率的测定方法，及其计算漏风量和风机供风量的公式。
With the nature of high efficiency, ultra silent & outstanding performance, Broan's Range Hoods and Ventilation Fans hold the incomparable leadership position in North America.
百朗吸油烟机和换气扇以其高效能，低噪音，性能稳定等特点在北美市场处于绝对领先地位。
With the nature of high efficiency, ultra silent & outstanding performance, Broan's Range Hoods and Ventilation Fans hold the incomparable leadership position in North America.
百朗吸油烟机和换气扇以其高效能，低噪音，性能稳定等特点在北美市场处于绝对领先地位。
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