"Exhaust Fan" is a kind of axial fans. Mainly used in negative pressure ventilation and cooling project called industrial exhaust type fan. "Exhaust Fan" with large air duct, large diameter blades, large exhaust volume, ultra-low power, low speed, low noise characteristics. And cooling water curtain can be used together in one fell swoop to solve the ventilation and cooling problems. "Exhaust Fan" of running a negative pressure is formed in the indoor environment. If you install the cooling water curtain on the other side wall of the exhaust type fan vent, exhaust this type of product, a fan in the indoor hot air from the outdoors, but also rich in water vapor will enter the room through the cooling water curtain cold air intake chamber, so as to achieve ventilation, cooling effect.