1. Color: orange, yellow, red, white, black 2. Available sizes: 4"-60" 3. Custom sizes are upon requests. Pvc flexible duct is made to supply and exhaust hot air for the confined spaces. Description -it is made of fire-resistant pvc fabric, temperature range -20-80ï¿½c. -with the support of helix steel wire and black rubber strip, it is wear-and-tear proof. -it is characterized by its fire resistant, oleic acid proof. -flexible and light weight for easy use and installation. Rolls up for easy transportation and storage. -size: custom size are available upon request. Standard diameter:100mm-1500mm, standard length: 5m, 10m Additional information -oem service is available, we have the experienced r&d team. -color: yellow, orange, green, redï¿½?ï¿½ -packing: neutral carton packing. -payment terms: 50% as deposit, the rest 50% should be paid off before shipment. -moq: 100 pcs. We also accept small test orders. 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.