1. Mirror designed and injection moulding stainless steel blades, with big air volume, never distortion and broke.
2. Fan galvanized round frame with zinc-coated of 180g/ sqm, to ensure never rust.
3. Flanging edge backflow design increase ventilation, reduce vibration and noise, imporovr fan's stability.
4. Heavy weight safe guard which can protect fan's blades, safety and fastness.
5. Light and easy for carry.
Experiment Proved: In order to get the best ventilation effect, optimum installation site lies in the right above of the feeding trough. Distace between the fan's bottom and ground is 2.7m. Inclination angle is better from 15 -30 degree.