fine series fans type-250---pr

Products Name:roof exhau
Quantity:min20sets
Packaging:by boxes
Full Size:according
Place of Origin:Shanghai
Appearance of Type 250
Blades:22
Total height:390mm
Turbine diameter:390mm
Ventilation caliber:380mm
Sole plate(galvanized sheet)=:380*380mm

why use non-power fan
Non-power fan is a equipment that using the theory of air convection. Speeding up any parallelly flowing air ,and it can change air-flowing direction into vertical movement., so that the efficiency of ventilation can be improved. Without using electric,it makes no noises. It not only can it guarentee long-term operation,but also can dispel the heat and humidity in the room. It has been very popular among develpoed countries for over than ten years. Today as there are more and more steel-structure buildings built, non-power fan is widely used in China as well.