We just completed a full roof replacement in Ijamsville MD, using Owens Corning Duration shingles in color: Peppercorn. We used all Owens Corning components for a system installation. We installed three new power fans in place of the old ones and did not install a ridge vent. Manufacturers frown on using both in the same attic space and can void warranties if you do so. The job took two days for a 5400 square foot roof