Used 195 Sq Ft Doyle and Roth 304 Horizontal Stainless Steel Shell and Tube Heat Exchanger. Shell rated 425 PSI/FV @ 350F ; (55) .75" x 18' tubes rated 425PSI/FV @ 350F. Approximately 29" OAH x 245" OAL. Weight 1,600 lbs. National Board #21679. Serial #S2766-8. Built 2015.