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The basic principle of airflow organization in white iron ventilation engineering is that the exhaust outlet should be as close as possible to harmful sources or heat dissipation equipment, and the air supply outlet should be as close as possible to the operating location or the place where personnel frequently stay.

通風管道是通風系統的重要組成部分，通風管道系統設計的目的，白鐵通風工程是要合理地組織空氣流動，在保證使用效果的前提下，合理確定風管的結構、布置和尺寸，使系統的初投資和運行費用綜合較低。從理論上說，在送、排風管進入土建豎井處設與不設層流板其阻力系數相差可達10倍，從某工程實際檢測中發現，同樣型號的的風機近似的風管和風口，用作送風時風量為9780m3/h，用作排風時風量為6560m3/h，差距達成22.7%。風口選用偏小也是系統阻力增大，風量下降的一個因素。

Ventilation ducts are an important component of the ventilation system. The purpose of designing a ventilation duct system is to organize air flow reasonably in a white iron ventilation project. On the premise of ensuring the effectiveness of use, the structure, layout, and size of the air ducts should be reasonably determined, so as to comprehensively reduce the initial investment and operating costs of the system. In theory, the difference in resistance coefficient between installing and not installing laminar flow plates at the point where the supply and exhaust ducts enter the civil vertical shaft can be up to 10 times. From an actual inspection of a certain project, it was found that the similar air ducts and tuyeres of the same model of fan have an air flow rate of 9780m3/h when used for air supply and 6560m3/h when used for exhaust, with a difference of 22.7%. The smaller selection of air vents is also a factor in increasing system resistance and decreasing air volume.

根據風機的特性曲線可以看出，風機可以在各種不同的風量下工作，風機在特性曲線的某一工作點上，風機的風壓與系統中的壓力得到平衡，就確定了系統的風量。

According to the characteristic curve of the fan, it can be seen that the fan can operate at various air volumes. At a certain working point on the characteristic curve, the fan's air pressure is balanced with the pressure in the system, and the system's air volume is determined.

設置防火閥的主要目的是防止火災通過風管漫延。推薦采用將衛生間排氣支管接入排氣豎井井上升60mm的防止回流措施，其具有結構簡單，造價低、運行可靠等特點，由于采用彎頭進豎井，支管與主管氣流方向相同， 此部分局部阻力小，其豎井排風總阻力并不一定由于豎井面積減少一點而增大。

The main purpose of setting fire dampers is to prevent fires from spreading through ducts. It is recommended to take measures to prevent backflow by connecting the bathroom exhaust branch pipe to the exhaust shaft and raising it by 60mm. It has the characteristics of simple structure, low cost, and reliable operation. Due to the use of elbows to enter the shaft, the branch pipe and the main pipe have the same airflow direction, and the local resistance in this part is small. The total resistance of the vertical shaft exhaust does not necessarily increase due to a slight reduction in the shaft area.