在通风系统中，依靠通风管来送入或抽出空气。通风管的截面有圆形和矩形。通风管除直管外，由弯头、变径弯，三通、四通等管件按工程实际需要组合而成。
In a ventilation system, air is fed in or drawn out by means of a ventilation pipe. The cross section of the ventilation pipe is round and rectangular. In addition to the straight pipe, the ventilation pipe is composed of elbow, reducing bend, tee, cross and other pipe fittings according to the actual needs of the project.
完成整个通风系统，以下几个备件必不可少：
To complete the whole ventilation system, the following spare parts are essential:
1、各类风口。为了向室内送入或室内排出空气，在通风管上设置的各种型式的送风口或吸风口，以调节送入或吸出的空气量。风口的类型很多，常用的类型是装有网状和条形格栅的矩形风口，设有联动调节装置，其他的类型没有联动调节装置。风口分为单层、双层、三层及不同形式的散流器。
1. All kinds of tuyeres. In order to send or discharge air into or out of the room, various types of air supply outlets or suction outlets are set on the ventilation pipe to adjust the air quantity. There are many types of tuyeres. The commonly used type is the rectangular tuyere with mesh and bar grille, which is equipped with linkage adjustment device. Other types have no linkage adjustment device. The tuyere is divided into single-layer, double-layer, three-layer and different forms of diffusers.
2、阀门。安装于风管上的用以调节风量和关闭个别支管的通风部件。通风与空调工程常用的阀门有插板阀、蝶阀、多叶调节阀、圆开瓣式启动阀、空气处理室中旁通阀、防火阀和止回阀等
2. Valve. The ventilation component installed on the air duct is used to adjust the air volume and close individual branch pipes. The valves commonly used in ventilation and air conditioning engineering include gate valve, butterfly valve, multi leaf regulating valve, round opening valve, bypass valve in air handling room, fire damper and check valve, etc
3、消声器。防止噪声传入室内所采用的装置。在空调工程中采用的有阻性捎声器、抗性捎声顺、共振性消声器和宽频带复合式消声器等。
3. Muffler. A device used to prevent noise from entering the room. In the air-conditioning engineering, there are Resistance Muffler, resistance muffler, resonance muffler and broadband composite muffler.
4、除尘器。是净化空气的一种设备，一般分为旋风式除尘器、湿式除尘器和袋式除尘器等。
4. Dust collector. It is a kind of air purification equipment, which is generally divided into cyclone dust collector, wet dust collector and bag dust collector