Used 12,000 Sq Ft Horizontal CS Heat Exchanger. CS Shell rated 365 PSI @ 600 Deg F. CS tubes rated 365 PSI @ 600 deg. F. Shell: 4' 8" dia. (1800) 3/4" dia tubes X 34' L. 1 Pass Shell & Tubes. Built by CF Braun, flanged in the middle (2 exchangers bolted together). Previous use: Main Gas Heat Exchanger.