1. Fan blade is made of mirror stainless steel by punch forming. Large air volume, no deformation, no dust, attractive and durable.

2. Fan galvanized round frame with zinc-coated of **0g/sqm, increase zins-coated layer, to ensure never rust. Flanging edge backflow design increase ventilation, reduce vibration and noise, improve fan's stability.

3. Fan blades are adjusted by intelligent dynamic-balance tester, ensure the fan smooth running, lower vibration, less noise, increase stability and service life.

4. SANHE motor with aluminum-magnesium alloy housing, good heat emission, high efficiency, reasonable dimension, light weight, low current, big torque

5. Experiment Proved: In order to get the best ventilation effect, optimum installation site lies in the right above of the feeding trough. Distance between the fan's bottom and ground is 2.7m. Inclination angle is better from *5°to *0°