Used approximately 30 sq.ft. Allegheney Bradford Sanitary Construction horizontal Shell and Tube Heat Exchanger.Shell & Tubes rated 150 PSI @ 350 deg F. SS Shell 2" in/out; SS Tubes 1.5" in/out. Unit has (52) 5/16"ID x 5'L U-tubes. Shell - 1 pass; Tubes - 4 pass. Serial #1112-04-2.