12 Pipe Length (3x5) Concentric Vent Stainless Inner

Features fully unitized, twist-lock construction in 3" diameters. It can be used in both vertical and horizontal installations. Stainless steel welded seam inner wall, combined with a galvalume welded seam outer wall. Inner and outer are sealed with O-Ring gaskets. Galvalume or painted black outer finish. To calculate installed length, subtract 1 1/2" from each length of pipe.