Ventilation and air conditioning, duct insulation should be selected according to the design requirements of thermal insulation and thermal insulation, duct insulation paste method and fastening is generally used method. As many of the application of new type thermal insulation materials, thermal insulation of ventilation and air conditioning engineering construction are increasingly environmentally friendly, efficient and easy ventilation ducts in Wuxi. Insulation should have good cover, its construction material chosen should take into account the environmental conditions and protected against rain, moisture requirements, in addition, to achieve insulation structure of smooth, beautiful appearance. Insulation from the inside out, from rust-proof layer, insulation, vapor barrier, protective coating, coating and marking components Wuxi pipeline processing. (1) the rust layer. After surface cleaning of pipes and equipment painted antirust paint, brushing 1 or 2 times.