Used Mueller Accu-Therm 346.5 sq ft stainless steel plate heat exchange. Has (70) 55" x 17" plates. National Board # 41298. Model AT40 F-20. Serial # 353920. Maximum working pressure is 150 psi @ 350 deg F. Minimum Design Metal Temperature is 32 deg F @ 150 psi. Maximum pack length for 70 plates is 15.9" and minimum is 15.34". Heat exchanger has (4) 3" sanitary Tri-Clamp inlets/outlets. Gasket material is EDBM. Plates are on stainless steel rods that connect to carbon steel ends. Built in 2006. Good condition.