正压通气就是说在吸气和呼气时肺内压始终高于大气压。也是说，气是被吞进去的，而不是被吸进去的。我所知道的唯一一类正压通气动物是蛙类。。
针对烟气换热器壁面温度会低于排烟露点的情况，提出了正压通风燃气锅炉排烟热能利用系统。
Aimed at the fact that the wall temperature of heat exchanger is lower than the dew point of flue gas, the thermal energy utilization system for flue gas of positive draft gas boiler is proposed.
安装正压或正供通风系统。
正压控制的设计原则和方法；楼梯间的通风设计以及紧急状态下HVAC系统的运行逻辑设计。
It mainly deals with the design method and principle of fire damper, positive pressure control, ventilation of stair room and running logic of HVAC in emergence situation.
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