1500 Spiral Duct Forming Machine HVAC Auto Duct Line ...
Auto Duct Production Line; Rectangular Duct Making Machine; ... 9. can produce a variety of different diameter spiral tube ...,to exclude harmful gas outdoors,the outdoor fresh air to the indoor.In general,the flow of ventilation system is very big,therefore require the use of Yin force smaller air pipelines,in order to save cost and operation ...
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