The flexible duct is made in the framework and the plastic cloth,it is able to endure the high temperature,the acid,the alkali, the oleic acid and burning,it is easy to turn and to connect and convenient to schlep.It has been extensively used in the construction in the bad air surroundings.

The diameter of flexible duct is from 100mm to 1000mm and it can be connected discretionarily.

The framework of the flexible duct is made of steel wire,the body is wrapped with the saffron plastics cloth,for it can fix the flexible duct expediently,there is a metals ring every one meter,for it can connect the Portable Ventilator discretionarily,the both two sides are bunched with the rope.The flexible duct is able to endurethe high temperature,the acid,the alkali,the oleic acid and burning,it is easy to turn and to connect and convenient to schlep.It had been extensively used in maintaining the underground cable,the engine room,the crypt,the tunnel conduit engineering,the machine shipbuilding and repairing,the firefight rescue and the other construction in the bad air environment.