Some methods and application characteristics that pretreat the fresh air by using exhaust air was summarized, and some problems should be paid attention to in the application were specified.

简述了空调系统利用排风对新风进行预处理的一些常用方法和使用特点，以及各种方法在使用过程中需注意的细节问题。

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Through the orthogonal experiments, the author found out the major factor affecting the combustion and thermal characteristics from the gas pressure, water flow, air-inlet area and fume-exhaust area.

本论文通过正交实验从燃气压力、水流量、进风口面积和排烟口面积这四个因素中找出了影响强制平衡式燃气热水器的燃烧和热工特性的主要因素。

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Studied also are the noise spectrum characteristics and its relation with air pressure and intermittency during exhaust in addition to ways of eliminating impact noise.

分析了间歇排气噪声及其产生机理，并对其频谱特性、与气压的关系以及其中的冲击噪声特性和噪声消除进行了全面深入的研究。

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