1. Reasonable cone designing, low noise, big air flow, strong ventilation, low operating cost; 2. Imported bearing, high-strength, low noise, durable 3. Hot galvanized sheet shutter, antioxidant, light weight, no distortion, open and close well , prevent air backflow, 4. High-strength aluminum-magnesium alloy wheel, light weight, toughness good. 5. Stainless steel blades, no distortion, aesthetic durability. 6.The high efficient and energy-saving motor passed the national CCC certification. Also protection class: F grade
