EXPLOSION-PROOF PVC DUCTING- Duct hosing applied hard-wearing, flexible vinyl weaved polyester, smooth inside wall. PVC ducting is designed to be super flexible and anti-explosion. ROPES ADJUSTABLE- Thick ropes can be adjusted to fit the duct's mouth size, ensuring a good-sealing environment, high working efficiency, and more. D-SHAPED RINGS- Flexible duct features D-shaped rings design for hanging the PVC flexible duct smoothly. REINFORCED FRAME- Wear-resistant professional industrial adhesive tape and thickened high carbon wire spring ensure rings to be practical and durable. WIDE APPLICATION- Our flexible PVC ducting is designed for ventilation applications, including duct fans and vent exhausts in factories, basements, farms, chemicals, tunnel, automobile manufacturing, etc.