Allows outside air to flow naturally upward and out of attic. Promotes a cooler, dryer attic. Helps prevent moisture from becoming trapped in insulation, structural wood, shingles and roof deck. Helps prevent rotting, mildew, drywall damage, peeling paint and warped siding. Provides year-round performance for consistent ventilation without energy consumption. Contributes to meeting criteria for high performing buildings, including Leed. Owens Corning ventilation products will help prevent damage and premature aging caused by moisture in the winter and excess heat in the summer.