1、圆形风管的加固：圆形风管由于其本身的强度较高，而且风管两端的法兰起到一定的加固作用，当圆形风管的直径大于或等于800mm，且其管段长度大于1250mm或管段总表面积大于4m2时，每隔l500mm才加设一个扁钢加固圈，并用铆钉固定。为了防止咬口在运输或吊装时裂开，圆形风管的直径大于500mm时，其纵向咬口的两端用铆钉或点焊固定。
1. Reinforcement of round air duct: because of its high strength, and the flanges at both ends of the air duct play a certain role in reinforcement, when the diameter of the round air duct is greater than or equal to 800mm, and the length of the pipe section is greater than 1250mm or the total surface area of the pipe section is greater than 4m2, a flat steel reinforcement ring is added every l500mm and fixed with rivets. In order to prevent the seam from cracking during transportation or hoisting, when the diameter of circular air duct is greater than 500mm, both ends of its longitudinal seam shall be fixed with rivets or spot welding.
2、矩形风管的加固：与圆形风管相比，矩形风管自身的强度低，易于产生变形。当矩形风管的大边长大于或等于630mm，保温风管大边长大于800mm，管段长度在1250mm以上，或低压风管的单边平面积大于1.2m2，中、高压风管大于1.0m2时，为了减少风管在运输和安装中的变形，制作时必须采取加固措施。
2. Reinforcement of rectangular air duct: Compared with round air duct, the strength of rectangular air duct is low and it is easy to deform. When the large side length of rectangular air duct is greater than or equal to 630mm, the large side length of thermal insulation air duct is greater than 800mm, the length of pipe section is more than 1250mm, or the single side flat area of low pressure air duct is greater than 1.2m2, and the medium and high pressure air ducts are greater than 1.0m2, in order to reduce the deformation of air duct during transportation and installation, reinforcement measures must be taken during fabrication.
3、通风管防火包裹的做法
3. Practice of fireproof wrapping of ventilation pipe
（1）如果风管的材料不耐火，但是又有可能接触明火，比如说一段PVC材料的通风管被架设在加热器附近，那么就有必要做防火处理。
(1) If the material of the air duct is not fire-resistant, but may be exposed to open fire, for example, a section of PVC air duct is erected near the heater, it is necessary to do fire prevention treatment.
（2）如果风管输送的气体易燃易爆更好是有防火包裹。比如一个正压风管输送带有油烟的废气，防火包裹能延长通风管耐受时间，避免风管烧毁，大量气体溢出会导致爆燃。
(2) If the gas conveyed by the air duct is flammable and explosive, it is better to have a fireproof package. For example, a positive pressure air duct conveys exhaust gas with lampblack. The fireproof package can extend the tolerance time of the air duct, avoid burning the air duct, and a large amount of gas overflow will lead to deflagration.
（3）如果风管输送的气体对温度敏感，可能是气体组分对温度敏感、容易温度变性。这时不仅要有恒温处理，也要有防火处理，以免意外情况发生。
(3) If the gas transported by the air duct is sensitive to temperature, it may be that the gas components are sensitive to temperature and easy to change. At this time, not only thermostatic treatment, but also fireproof treatment should be provided to avoid accidents.
（4）如果是暴露在高温易燃环境，风管一般都要有防火处理。饭店的火灶上部的排风管除外，其一般用花铁皮板打造，很多时候火焰能烧到
(4) If it is exposed to high temperature and flammable environment, the air duct shall generally have fireproof treatment. Except for the exhaust pipe above the fire stove in the hotel, it is usually made of patterned iron sheet, and the flame can burn to
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