8 in. Mill Finish Aluminum Internally Braced Whirlybird Wind TurbineTurbines offer all of the essentials for energy savings and are geared towards going green while maximizing ventilation capacity. When installed with adequate intake ventilation, the Lomanco turbine reduces energy bills and the likelihood of winter ice buildup. The turbine design features permanently lubricated upper and lower ball bearings that ensure long life and no maintenance. Extends the life of shingles, insulation and other building components