The SPRD will automatically open as the air pressure in the duct system increases, in order to prevent the reduction of air flow and excessive noise and velocity through the duct system.
当管道系统空气压力增加时，SPRD会自动开启，以防止管道系统中空气流动的减少和过度噪音和速度。
The extraction fan 1HU removes air from the lavatories and the galleys through a duct which is installed above the cabin ceiling.
抽气风扇通过安装在客舱天花板上的管道，把厕所和厨房的空气抽出来。
The problems of low intensity and air leakage were solved through reforming the structure of gas duct.
通过对烟风道的结构改造解决了强度低、运行漏风的问题。
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