Poultry house fan: 1.Big air volume,low noise 2.imported bearing, high strength, low noise and long service life Cone fan:1. Reasonable cone designing, low noise, big air flow, strong ventilation, low operating cost;2. Imported bearing, high-strength, low noise, durable3. Using air downstream principle, PVC shutter or aluminum shutter, antioxidant, light weight, no distortion, open and close ...