High quality exhaust fan, industrial ventilation fan 1-Centrifugal system 2-Low price, low noise 3-Big wind volume Ventilation fan, axial ventilation fan, ventilator Wet pad and ventilation fan system is the best cooling system widely used in many places like, big hall, supermarket, chemical plants, big factory workshops etc. Negative-pressure ventilating fan series are designed scientifically. Low cost, low noise, good ventilation effect, strong air flow, energy saving, long lasting and high efficiency. The stainless steel kinds are waterproof and dustproof effects. By pumping the air with negative pressure, the fan circulates the air indoor and outdoor, and drive out the heat in the workshop. Ventilating fan is applicable for these areas: 1. Industrial field: textile, clothes making, glass, rubber, food processing, etc. 2. Civil field: super markets, cyber club, big dinning hall, waiting room etc. 3. Agriculture field: large farms, green houses, animal houses etc.