Whirlybird Turbine, Cap Vent Round, Roof Ventilator, 12 Inch External Extractor Wall Dryer Vent Cap, Stainless Steel Louver Grille Cover, DIY Easy Vent Hookup Kit, for Ventilation and Exhaus

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.

• Product material: Ventilation Outlet made of 304 stainless steel, durable, utilizing the natural wind and air thermal convection generated by the temperature difference between indoor and outdoor, driving the turbine to rotate, discharging the dirty indoor air.
• Wide range of applications: farms, machinery factories, roof chimneys, industrial plants, production workshops, kitchens, canteens, farming, workshop ventilation Wind, tile house, flue exhaust smoke and other areas
• Simple installation: all air hoods are shipped as a whole, no assembly is required, comes with mounting accessories for easy installation, and can be freely operated on relatively gentle slopes to further expand the installation range by simply removing and fixing them.
• Vent Connection Size: 4.3inch(110mm), 6.3inch(160mm), 7.9inch(200mm), 9.8inch(250mm), 11.8inch(300mm), 15.7inch(400mm)
• Rainproof and noiseless: curved wind blade encrypted blades to ensure that rainwater does not intrude under the working condition. High exhaust efficiency Lightweight operation. The chimney rotary hood is especially suitable for chimneys that are not frequently used.