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In daily life, there are pipes everywhere, but what they are used for is not very clear. Ventilation pipes seem simple, but in fact, each rough pipe is composed of many different functions, which can meet the building's multiple requirements for ventilation and associated, so it is more convenient to use. As a ventilation duct, we should strive for perfection in each individual component. Let's take a look at which parts the ventilation duct is composed of.

1、通風管道。在通風系統中，依靠通風管來送入或抽出空氣。通風管的截面有圓形和矩形。通風管除直管外，由彎頭、來回彎、變徑彎，三通、四通等管件按工程實際需要組合而成。

1. Ventilation duct. In a ventilation system, air is fed in or drawn out by means of a ventilation pipe. The cross section of vent pipe is circular and rectangular. Except for straight pipes, ventilation pipes are composed of elbows, back and forth bends, reducing bends, tees, crosses and other pipe fittings according to the actual needs of the project.

2、各類風口。為了向室內送入或室內排出空氣，在通風管上設置的各種型式的送風口或吸風口，以調節送入或吸出的空氣量。風口的類型很多，常用的類型是裝有網狀和條形格柵的矩形風口，設有聯動調節裝置，其他的類型沒有聯動調節裝置。風口分為單層、雙層、三層及不同形式的散流器。

2. Various air outlets. In order to supply or exhaust indoor air, various types of air supply or suction outlets are set on the ventilation pipe to regulate the amount of air supplied or sucked. There are many types of tuyeres. The commonly used type is the rectangular tuyere with mesh and strip grid, which is equipped with linkage adjustment device. Other types have no linkage adjustment device. The tuyere is divided into single layer, double layer, three layers and diffusers of different forms.

3、閥門。安裝于風管上的用以調節風量和關閉個別支管的通風部件。通風與空調工程常用的閥門有插板閥、蝶閥、多葉調節閥、圓開瓣式啟動閥、空氣處理室中旁通閥、防火閥和止回閥等，

3. Valves. Ventilation components installed on air ducts to regulate air volume and close individual branches. The valves commonly used in ventilation and air conditioning engineering include gate valve, butterfly valve, multi blade regulating valve, round open flap starting valve, bypass valve in air handling room, fire damper and check valve, etc,

4、消聲器。防止噪聲傳入室內所采用的裝置。在空調工程中采用的有阻性捎聲器、抗性捎聲順、共振性消聲器和寬頻帶復合式消聲器等。?

4. Muffler. Devices used to prevent noise from entering the room. Resistive sound carrier, reactive sound carrier, resonant muffler and broadband composite muffler used in air conditioning engineering.?

5、除塵器。是凈化空氣的一種設備，一般分為旋風式除塵器、濕式除塵器和袋式除塵器等。

5. Dust remover. It is a kind of equipment for purifying air, generally divided into cyclone dust remover, wet dust remover and bag type dust remover.

6、通風機。是機械通風系統中迫使空氣流動的機械。通風機是通風與空調系統的主要設備，根據構造原理分為軸流式通風機和離心式通風機兩類。

6. Ventilators. It is a mechanical ventilation system that forces air to flow. Fan is the main equipment of ventilation and air conditioning system, which can be divided into axial flow fan and centrifugal fan according to the structure principle.

7、風帽。它用于排風系統的末端，它的作用是向室外排除污濁空氣。按其形式分有：適用于一般機械排風系統的傘形風帽，適用于除塵系統的錐形風帽，適用于自然排風系統的簡形風帽。

7. Hood. It is used at the end of the exhaust system, and its role is to remove dirty air to the outside. According to its form, it can be divided into: umbrella type wind cap suitable for general mechanical exhaust system, cone type wind cap suitable for dust removal system, and simple type wind cap suitable for natural exhaust system.