什么是风管，常见风管有哪些类型
What is air duct and what are the common types of air duct
风管主要指中央空调系统的通风管道，它常常被忽视，但却是空调系统的重要组成部分。风管是由薄钢板、铝板、硬聚氯乙烯板、玻璃钢以及其它复合材料等制成的，用于输送空气和空气混合物的各种管道的总称。
Air duct mainly refers to the ventilation duct of the central air conditioning system. It is often neglected, but it is an important part of the air conditioning system. The air duct is made of thin steel plate, aluminum plate, rigid polyvinyl chloride plate, glass fiber reinforced plastic and other composite materials. It is the general name of various pipes used for conveying air and air mixture.
1、按照材质可分为：
1. It can be divided into:
金属风管、非金属风管。其中：
Metal air duct and non-metal air duct. Wherein:
（1）金属风管又可分为：
(1) Metal air ducts can be
（2）非金属风管可以分为：
(2) Non metallic air ducts can be divided into:
硬聚氯乙烯风管、有机玻璃风管、无机玻璃风管、玻璃钢风管以及其它复合材料风管等；
UPVC air duct, plexiglass air duct, inorganic glass air duct, FRP air duct and other composite air duc