The basic function of ventilation equipment is to transport fresh air and exhaust, exhaust harmful gases to the outside, and bring outdoor fresh air into the room. Anti corrosion and thermal insulation facilities shall be installed for ventilation equipment.

安装镀锌通风设备，安装不锈钢通风设备在腐蚀性和特别潮湿的地方。当环境空气湿度较高时，应对管道外墙进行防腐防锈处理。输送高温、高湿气体的风道内壁应喷涂磷化底漆或其它耐腐蚀涂层。当风道输送高温气体或低温空气时，风道外壁应进行保温(冷)。

Install galvanized ventilators and stainless steel ventilators in corrosive and particularly humid places. When the ambient air humidity is high, the anti-corrosion and anti rust treatment should be carried out on the external wall of the pipeline. The inner wall of air duct conveying high temperature and humidity gas shall be sprayed with phosphating primer or other corrosion-resistant coating. When the air duct conveys high temperature gas or low temperature air, the outer wall of the air duct shall be insulated (cold).

输送高温气体的风道保温的目的是防止风道内空气的热量散失(冬季空调系统出现)；二是在输送余热蒸汽或高温气体，提高室内温度时，防止热量散失到室内，防止人们接触风管而被烧伤。在夏季，由于输送气体的温度低于周围空气的露点温度，管道外壁会发生冷凝。这将增加空调系统风道的冷却损失。同时，凝结的水滴会污染天花板、墙壁和地面，所以要进行冷保温。

The purpose of heat preservation of air duct conveying high temperature gas is to prevent heat loss of air in air duct (central air conditioning system in winter); The second is to prevent the heat from losing to the room when the waste heat steam or high-temperature gas is transported and the indoor temperature is raised, so as to prevent people from being burned due to contacting the air duct. In summer, because the temperature of the transported gas is lower than the dew point temperature of the surrounding air, the outer wall of the pipeline will condense. This will increase the cooling loss of the air duct of the central air conditioning system. At the same time, the condensation of water droplets will pollute the ceiling, walls and floor, so cold insulation.

当通风管道输送一般气体时，对黑钢板风道应进行除锈、刷防锈漆处理，对含尘气体可喷涂防磨损保护层，当周围环境空气湿度较大时，风道外壁需做防腐蚀、防锈处理。对输送高温、高湿气体的镀锌钢板风道内壁宜喷刷磷化底漆或其他耐蚀涂料。在风道输送高温气体或低温空气时，风道外壁应做保温(保冷)处理。

When the ventilation pipe conveys general gas, the black steel plate air duct shall be derusted and painted with antirust paint, and the dust gas can be sprayed with anti-wear protective layer. When the ambient air humidity is high, the outer wall of the air duct shall be treated with anti-corrosion and antirust treatment. Phosphating primer or other corrosion resistant coating should be sprayed on the inner wall of air duct of galvanized steel sheet conveying high temperature and humidity gas. When conveying high-temperature gas or low-temperature air in the air duct, the outer wall of the air duct shall be insulated (cold insulation).