Stainless Steel Exhaust Cap, Wind Turbines Air Vents, Louvered Grille Cover Vent Hood, for Ventilation and ExhaustProduct Name: Roof VentilatorMaterial: Thickened 304 stainless steelProduct Color: SilverProduct Specifications:110mm---400mmProduct features: no energy power, high speed, high precision, high density, rain and smoke backflow preventionProduct Principle: The use of natural wind and indoor temperature difference caused by air thermal convection to promote the rotation of the turbine so as to use the centrifugal force and the negative pressure effect will be indoor not fresh air out.
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