100 sq.ft. SS Heat Exchanger, by American Standard, Model: SSCF-C, S/N: 8-10046-02, (72) – 5/8" O.D. x 8’ 6†long stainless steel tubes, rated 100 PSI @ 450°F. 8" dia. stainless steel shell, rated 220 PSI @ 450°F. Shell-1 pass, Tubes-1 pass, Horizontal. OAL: 11’ 4â€. NB: 28259.