Turbine chimney cap. Anti-Downdraft chimney caps vary from mechanically spinning devices, like the turbine, to stationary designs that incorporate physics to provide the result. 81-inch wide design provides extended rain protection, preventing water infiltration and potential damage. 10" TURBINE CAP Stainless Steel. "Keep your chimney safe and efficient with a premium single flue chimney cap. Volko Chimney Caps chimney turbines & turbine ventilators ventilation solutions for your fireplace and wood stove. Regardless, any type of non-motorized draft cap will only provide draft assistance for a wind related issue. " Roof Ventilator Wind Turbines Cap Fan Air Vent Round Exhaust Hood Waterproof Leak Proof Caliber Chimney Flue Cover Sturdy Roof Vent Material: 304 stainless steel Advantages: discharge indoor hot air and dirty air, purify the indoor environment Principles: Utilize natural wind and indoor temperature difference, air -to -flow drives turbines Volko Chimney Caps chimney turbines & turbine ventilators ventilation solutions for your fireplace and wood stove. com FREE DELIVERY possible on eligible purchases "Keep your chimney safe and efficient with a premium single flue chimney cap. PRODUCTS Sleepy Hollow Chimney Supply - Super Turbine HIgh quality wind directional caps or windcaps to prevent downdraft and backdraft while protecting chimneys from rain and wind. Provides positive ventilation with the slightest breeze. oponobkmuphpdshvryazczngdmcfsnfdasymfykzldzfffyqvts