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Fluorine Carbon Polyester Coating Aluminum Alloy VentilatorModel:  500 Materials: Adopting 3005# aluminum alloy as base material, outer layer coating fluorine carbon polyester greater than 20 µm; Japanese NSK bearing; fireproofing reinforced nylon trestle or metal trestle; rivet to connect.Benefits: Light weight, high revolving speed, strong corrosion resistance, high air exhausting efficiency, sturdy and durable, clean and smooth, uniform color, and easy maintenance. Working Condition: Temperature difference between indoor and outdoor is 0.45, It begins to revolve at the wind speed of 0.12m/ s.     Roofing Angle: Applied in different roofing in the scope of 0-22.5°oblique angle.Warranty: 15 years Applicable scope: Industrial workshop, commercial and civil housing. Origin of product: China Advantages: It is no electricity or energy costing and noiseless. exhausting air naturally and effectively.It can work long time so as to make fresh air c