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Material	PVC
Features	This type of duct is in single-layer structure and is made of  PVC material.  The inner part is filled with highly tensile spiral steel wires to support the duct. The duct is generally applied on low to medium air velocity with temperature variantion system. This product has passed GB8624B1 fire resistant test.

Size	Standard length	Maximum velocity rate	Temperature range	Maximum pressure resistant rate
2.5"-12"	10M	28M/S	5℃～80℃	250mmWG