Ventilation duct, Ventilation pipe, air duct, pvc flexible duct 1,Material: PVC flam-resistant static-free fabric with helix steel wire. 2,Size:width: 50mm to 2000mm length:1m to 40m (or according to customer's request) 3,Main color: yellow,orange, white, black ect. 4,Application: PVC Flexible Duct is widely used in these working environments such as tunnel, basement, shipp yard. Or it could be applied in the processes of eelectric welding and waste gas treatment.