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 ventilator discretionarily, the both two sides are bunched with the rope. The flexible duct 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 maintaining the underground cable, the engine room, the crypt, the tunnel the municipal conduit engineering, the machine shipbuilding engineering, the fire fight rescue and the other construction in the bad air environment.
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Prevention the oxygen deficiency
