Bell and Gossett SU-Series Shell & Tube Heat Exchanger. Model: SU105-2. Carbon steel shell. (76) ¾ in. dia. x 5 ft. L copper multi-tubes. Heat transfer surface area: ~ 71 sq. ft. Tube volume: 8.7 gal. The SU-series tube bundles are of “U”-bend construction. This allows ample expansion or contraction for wide temperature variations. Tube spacers properly support and space each tube for maximum efficiency in steam condensing and drainage. Inlets: (1) 6 in. dia. flanged port (media), (1) 4 in. dia. FNPT (product). Outlets: (1) 4 in. dia. FNPT (product), (1) 1 ½ in. dia. port (media). Overall dimensions: 5 ft. 4 in. L x 1 ft. 2 in. W x 1 ft. 6 in. H. (ACN50a)