217 sq. ft. vertical cylindrical, graphite block heat exchanger. MFD by Carbone, model 1680-626-25,type BEM. Serial # 111172, NB# 1328, built 1999. ASME code stamped, shell rated 150 psi @ 400 deg. F, tubes rated 100 psi & FV @ 400 deg. F. Openings: Shell 2-4", tube side: 1-10", 1-8", 1-3".