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Selkirk Heat Fab© coaxial ( concentric) is designed for zero clearance to combustibles. Two pipes in one, intake air and exhaust. Inner wall is made of AL29-4c stainless steel, listed UL 1738. Outer wall is made of Stainless Steel. Approved for Category I,I I, III and IV gas burning appliances. Heat-Fab Saf-T Vent SC Part # SC03L36 *Installed length is 2.12" less than total length of pipe. *Do not mix different brands of pipe with this Heat Fab© brand.
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