Pipe Chimney Insulated 6in Ss 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 resists 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 of the insulation and also blocks radiation heat transfer. Tested to 2100 degrees F. UL listed. Features Length: 6" Stainless Steel For continuous operation at 1000F flue gas temp. at 2" clearance to enclosing combustible test structure without exceeding temperature limits Multi fuel chimney for gravity venting only Designed for "air-tight" wood stoves USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.