Description 1. Material: Transparent PVC material 2. Temperature range: -20-80°C 3. Supported by helix steel wire, so that the duct can stay on its own. 4. The steel wire is wrapped by black rubber strip for wear-and-tear protection. 5. Equipped with hanging rings every 1 meter. 6. End with rope for easy connection. 7 Available sizes: 100mm-1500mm, custom sizes are upon requests. 8.Flexible and light weight for easy use and installation. Rolls up for easy transportation and storage. Additional information 1. Packing: Neutral carton packing 2. Payment terms: TT before shipment 3. OEM service is available. Application -Avoid of any oxygen shortage accidents in the restricted air supply spots during municipal sewer servicing, underground cable maintenance, tunneling and subsurface repairing. Or exhaust the remaining hazardous gas and flammable explosive gas. -To supply fresh air into large-diameter steel pipe, container, fermenter, granary which are poorly ventilated. - To supply fresh air to the poorly ventilated spaces such as ship\\'s hold, crypt, storeroom, freezer and refrigerated container. - Exhaust the welding waste gas, fume, hazardous gas, dust and hot air causing by ship building and maintenance and manufacturing production in bad air environment. Create a comfortable working condition.