Used 11 Sq Ft Doyle and Roth Horizontal Carbon Steel Shell and Tube Heat Exchanger. Shell rated 425 PSI/FV @ 350F; (14) .75" x 3'10" tubes rated 425PSI/FV@350F. Approximately 1'OAH x 44" OAL. Weight 300 lbs. National Board #21572. Serial #S2766-7. Built 2015.