The DuraPlus 8 in. Diameter 6 in. Length Chimney Pipe is designed for appliances tested and listed for use with wood stoves, fireplaces, furnaces, boilers, stoves, ranges, water heaters, or other appliances fueled by wood, oil, coal, or gas. This triple-wall chimney pipe features two insulating layers (refractory blanket, plus air space) with its refractory insulation held securely in position, eliminating hot spots common with loose-fill type insulations. The chimney pipe is designed to stay cool on the outside, to provide a hot draft on the inside, to boost stove efficiency, and to provide for a fire-safe design.