国产av天堂亚洲国产av麻豆_精品午夜视频_精品国产1区2区3区AV_狠狠色丁香婷婷久久综合2021

Centrifugal fan is generally used in the indoor air ventilation of large-scale buildings such as factories; it can also be used in the high-pressure forced ventilation of boiler, and smithing furnace etc and material handling. The gas that centrifugal fan conveys is air or other gases that are not flammable, explosive or corrosive to steel materials. The gas should not contain any sticking substances, and the dust or hard particulate matters should not be bigger than 150mg/m3. The temperature of transported gas should not exceed 80°C.
The parameters in the draught fan performance table mean the performance of draught fan in the standard state. The standard state means that the atmospheric pressure is 101325Pa, the temperature is 20°C , the relative humidity is 50% and the air density is 1.2 kg/m3.