Hot Oil Heat Transfer Fluid Classification

Discussion created by on May 18, 2017

My hot oil heat transfer fluid has a flash point of 249F.  We operate the hot oil heater at 550F.  NFPA 497 (2017)paragraph 3.3.4 indicates that it is a Class IIIB liquid and paragraph indicates that area classification is seldom needed.  NFPA 497 (2017)paragraph indicates that it should be Class I, Division 2.  Which one is correct?