Duravent Double Wall Black Pipe Close Clearance Pipe for wood stoves and wood fireplaces, these wood stove parts may be compatible with other fuels. Designed for installation with minimum clearance to combustibles (6” to walls, 8” from top of horizontal run to ceiling). Available in 6”, 7”, and 8” diameters. Subtract ¾” for installed length. Constructed with a stainless steel inner wall