PVC4-62-PVC centrifugal fan performance parameters with reference to the use of metal 4-62 PVC plate, welded heated die. Widely used in scientific research, chemical industry, metallurgy, electronics, pharmaceuticals, textiles, instruments, electroplating, mining, schools, hotels, laboratories, environmental protection equipment and other industries for ventilation exclude acidity and other harmful gases for ventilation . But not transport with aromatic compounds, aliphatic and aromatic halogen derivatives of hydrocarbons, ketones and other corrosive gases. Resistant to chemical corrosion, not aging, the proportion of small, mechanical vibration, low noise, smooth running characteristics. It does not allow the transmission of gas with viscous material, containing dust and hard particles ≤ 150mg/m3, gas temperature ≤ 50 ℃ , relative humidity ≤ 100%. And to avoid sun exposure, fans in the vicinity may not have heat.