Used 49256 Sq ft Carbon Steel Fin Fan heat exchanger. Manufactured by Esex. 2313 sq ft (bare). 49256 sq ft (extended). (222) 1" OD Carbon Steel tubes with L-tension wrapped AL fins. 3-pass, 4 rows. Design 500 PSIG @ 450F. 8" inlet 1" vent and drain. (2) 25 Hp 4-blade fans. 460/60/3. Overall dims 40'11" x 11'. 24000 #. Serial #09P675-20. National Board #1231. Built 2009.