Adjustable from 12.5" to 19.5"
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 # SC03AJ
*Installed length is 2.12" less than total length of pipe.
*Do not mix different brands of pipe with this Heat Fab© brand.