4-1. This fan adopts advanced frontward open system, butterfly type, with two semicircle shutter doors, wind resistance is small, good air-tightness and high efficiency. 4-2. When the two semicircle shutter doors close, the rubber sealing ring make good air tightness. In different condition, not run all the fan, the air could pass through the space of stop fan, use this type fan, could avoid this problem. Ensure air pass through the evaporative cooling pads or air inlet only, so that greatly improve the fan efficiency, (as compared with different type of same size fan, improve efficiency 15-20%) 4-3. The fan motor installed on the top left corner, effective protection of the motor. Avoid wind resistance. And the motor panel connection is reasonable, fixing fan frame more stronger. 4-4. The frame is hot galvanized with advanced automachining technics.The thickness of the galvanized layer is 275g/m^2 4-5. Six blades one fan with stainless steel blade,Model 430BA.Do balance test to make sure the weight between each blade is similar.
Stainless steel blade,Do balance test to make sure the weight between each blade is similar