This is one of two Hydrotherm gas boilers installed at the Franklin Institute of Boston.  It's hard to believe that something so small can heat a building that size.  Dana was contracted to construct and install the AL294C single and double wall pipe for these condensing boilers.  Two 80 ft side wall stacks needed to be constructed and installed to vent these boilers.  The horizontal runs going from the boilers into the 80 ft stacks also needed to be constructed and installed from the same material.  To see another commercial project click http://www.dmstorrschimney.com/our-soot-stories/commercial-stainless-steel-stack-construction-in-somerville-complete- as always more to follow