Wind Turbine Attic Ventilator

12 standard internally braced wind turbine attic exhaust vent - top only. Galvanized steel construction - mill finish. Co-polymer bearing system for quiet, long-lasting, and smooth operation. Adjusts to 6/12 pitch. Tested to ensure durability and performance in extreme temperatures and high winds. This exhaust vent requires adequate soffit intake vents. Top only. Base and riser is not included. Mill finish. Lifetime limited . 12 standard internally braced wind turbine attic exhaust vent - top only. This product is manufactured in United States. This product meets customer requirement.