通气，如送鲜风和排气，这个范围很广，如工厂车间，生产场地空气，由于有害气体产生需要排出室外，又需要把室外空气输送至室内。这时就要使用流量大而压力小的空气输送管道，螺旋风管就最适用，一般情况下使用镀锌铁管，有腐蚀性及特别潮湿场所使用不锈钢管。
It includes ventilation, such as fresh air supply and exhaust. This range is very wide, such as the air in factories, workshops and production sites. Due to the generation of harmful gases, it needs to be discharged outdoors, and the outdoor air needs to be transported indoors. At this time, the air transmission pipeline with large flow and low pressure shall be used, and the spiral air duct is the most suitable. Generally, galvanized iron pipe shall be used, and stainless steel pipe shall be used in corrosive and particularly humid places.
(2) 送冷风
(2) Cold air supply
送冷风。最常见的是中央空调的管道，这种管道需要加保温材料。螺旋风管可内贴保温材料，外表看来美观。
Send cold air. The most common is the pipe of central air conditioning, which needs to be added with thermal insulation material. Spiral air duct can be pasted with thermal insulation material, which looks beautiful.
(3) 排油烟
(3) Oil fume exhaust
饭店、酒楼、宾馆的厨房均有大量油烟产生，需要排出，使用圆形的风管就是油烟囱。在这里，螺旋风管该叫做油烟管。
The kitchens of hotels, restaurants and hotels produce a large amount of oil fume and need to be discharged. The use of circular air duct is oil chimney. Here, spiral air duct should be called oil fume pipe