Glass fiber reinforced plastic composite glass fiber reinforced square fan fan. With the aging resistance, low noise, low power consumption, large amount of wind, blast away, easy to install features are industrial plants, warehouses, offices, flowers, greenhouse cooling, poultry house as well as other occasions perfect ventilation of the ideal choice. Gas temperature 70 ?, relative humidity less than 90 ?, dust content and solid low impurity = 100mg/M3 non-inflammable, explosive, corrosive gas.