Used 39 Sq Ft Doyle and Roth Horizontal Carbon Steel Shell and Tube Heat Exchanger. Shell rated 150PSI/FV @ 500F. (20) .75"OS x 10'L tubes rated 150PSI/FV @ 400F. Approximately 25" OAH x 141" OAL. Weight 1,220 lbs. Serial #S2777-3. National Board #21585. Built 2015.