When the  ventilation pipe to transport the general gas, the black steel pipe  ventilation pipe should be rust, brush anti-rust paint treatment, the  dust can be sprayed with anti-wear protective layer, when the ambient  air humidity is large, the ventilation pipe wall to be anti- Corrosion, rust treatment. For  the transmission of high temperature, high humidity gas galvanized  steel plate ventilation pipe wall should be sprayed with phosphating  primer or other corrosion resistant coating. In the  ventilation pipe conveying high temperature gas or low temperature air,  the ventilation pipe wall should do insulation (cold) treatment.