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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 allows the system to be enclosed with only 2 inch clearance to combustibles,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 Fahrenheit
