WEITINGKKK Soffit vents exterior,Vent cover, Roof Flue Vent Automatic Rotation By Wind/air Flow, No Consumption Ventilating Fan, For Residential Buildings Chimney Tops(11cm)

♥ The swivel chimney hood is made of 304 thick stainless steel, thickened and wear-resistant, and the galvanized rollers rotate flexibly, strong and strong in compression ♥ Zero energy chimney hood. Use the natural wind to makes it rotate and create a vacuum/vortex in the channel where it is installed, sucking smoke and dirty air from the inside, long service life ♥ Suitable for machinery workshops, farmhouses, restaurants, residences, roof chimneys, improve indoor air environment, speed up circulation ♥ No power hood, curved blade baffle neat and orderly, smooth and roundedge lines, maintenance-free, can be used for a long time Wall mount air vent-- the specially designed air vent prevents rain and excessive wind from entering the ventilation system.