Ventamatic Cool Attic 14" Galvanized Steel Mill Wind Turbine Attic Vent

14" standard internally braced wind turbine attic exhaust vent. 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. Requires 432 sq. in. of NFA (Net Free Area). Includes: Base and riser. Mill finish. Lifetime limited warranty.