Used 358 Sq Ft. U-Tube Heat Exchanger. Mfg by Energy Exchanger 1987. Carbon steel Shell (SA-106-B) rated 150 PSI @ 500 deg F; Carbon Steel Tubes (SA-214) rated 150 PSI @ 500 deg F. Carbon Steel Heads (SA-515). Shell - 1' 3.25" dia. x 17'2" L ; (56) Tubes - 3/4" dia. Flanged Nozzles: (2) 4", (2) 3". Type AEU. S/N: X-2919, NB# 1260.