通风管道是特地为一处或几处房间或设备送风和排风的管道。排烟管道是特地共排烟气的管道，就用途来讲有分别，就管道自身讲都是管道。 装置完的风管要保证外表润滑干净，室外风管应有防雨、防雪措施。 风管伸入构造风道时，其末端应装置上钢板网，避免系统运转时，杂物进入金 属风管内。金属风管与构造风道缝隙应封堵紧密。
When the air duct passes through the settlement joint, the casing should be added according to the design requirements, and the gap between the casing and the air duct should be tightly sealed with filler (soft). From these characteristics, we should be able to quickly distinguish the difference between the two.
The pipeline layout in the kitchen should follow the "short" principle, and use less elbows, especially large angle elbows. This kind of pipe layout is different from the "vertical and horizontal neat" of the air conditioner, so as to ensure the effect of exhaust fumes and save energy. The central position of the main outlet hood of the air collecting pipe above the hood.
When the height of the building where the kitchen is located is less than or equal to 15m, the oil fume outlet shall be higher than the roof. In principle, it should be more than 2m higher than the building. When the height of the building is more than 15m, the height of the oil smoke outlet should be more than 15m.
The outdoor exhaust outlet of the exhaust pipe shall be installed with the pipe cap (pipe cover) which is less affected by the outdoor wind pressure. Determine the exhaust volume according to the ventilation frequency. The kitchen area is not directly proportional to the number of kitchenware and stoves, and the pollutants and heat produced by the same stoves are also very different.
In fact, kitchen ventilation is not comprehensive ventilation, according to the number of ventilation design air volume will have a great error.