Features: * Type HT chimney pipe special augured in mineral wool insulation filling the space between stainless steel walls is only 1 inch thick yet provides 17 times the insulating valve of brick * This optimum density of insulation stops expansion noises and resist s and contains surges of heat * This allows the system to be enclosed with only 2 inch clearance to combustibles * The solid pack density comprises about 85 percent air * The mixture of extremely fine fibers trap this air in the pores * 8-inch I.D. - 10-inch O.D. * Length: 24 inches What"s In The Box: * Selkirk 208024 8-Inch x 24-Inch Insulated Stainless Steel Chimney Pipe