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Stainless steel ventilatorModel: 500Materials: Adopting high-quality korero puxiang 304/ 2B stainless steel, Japanese NSK bearing, fireproofing reinforced nylon trestle or metal trestle and rivet to connect.Benefits: Weather resistant and strong anti- wearable, fine non-viscidity and self- cleanness.Have high delicacy and high air exhausting efficiency. Working Condition: Temperature difference between indoor and outdoor is 0.45. It begins to revolve at the wind speed of 0.20/ s.     Roofing Angle: Applied in different roofing in the scope of 0-22.5°oblique angle. Warranty: 10 years Applicable scope: Industrial workshop, commercial and civil building.Origin of product: ChinaAdvantages:It is no electricity or energy costing and nioseless, exhausting air naturally and effectively. It can work long time so as to make fresh air circulating. Good surface self-lubricating performance, superior anti-corrosion, weather resistance, strong wear resistance, long servi