2.1.6 materials do Pipe duct (line Material)
.The material it is made all the air duct should be racing durable materials to use for a long time. The air duct with the most economical way and certainly the most is the welding, but the problem occurring isGood material. Seamless pipe made of steel pulling forming and joint can be achieved with the casing ring compression wear, if use special short range may use plastic pipe or tube.
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