One of the fire safety features of double-wall Type B gas vent is that its outer wall, insulated by the airspace beneath it, requires only 1â clearance to combustible material in the structure.
Fort Mill, also known as Fort Mill Township, is a town in York County in the U.S. state of South Carolina. It is a suburb of the city of Charlotte, North Carolina and is located north of Rock Hill.
Fort Sumter. Fort Sumter is a sea fort in Charleston, South Carolina, notable for two battles of the American Civil War. It was one of a number of special forts planned after the War of 1812, combining high walls and heavy masonry, and classified as Third System, as a grade of structural integrity. Work started in 1829, but was incomplete by 1860, when South Carolina seceded from the Union. The First Battle of Fort Sumter began on April 12, 1861, when Confederate artillery fired on the Union garrison. These were the first shots of the war and continued all day, watched by many civilians in a celebratory spirit. The fort had been cut off from its supply line and surrendered the next day.