Vent cover, 304 Stainless Steel, Ventilating Fan, Wind , Cap Vent Round, Dome Ventilator, Exhaust Hood Vent, Wind Turbines Air Vents, Whirlybird , 12-Inch Outdoor Exhaust Vent, For Ventilation And E (
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Select a product to estimate shipping.Dome Ventilator, Wall Ventilation Outlet, Internally Braced Wind , Venting Kit, PartsExtra, for Walls & Ceilings Product 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 and thus the use of centrifugal force and negative pressure effect will be indoor not fresh air out.
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