The pure copper finned tube is a finned tube. The stainless steel used has a corresponding surface temperature on the stainless steel grade, and this is also unquestionable. Therefore, for different grades of stainless steel, you should know the corresponding temperature, in order to have a good use. On the second question, it can be said that the answer is yes, that is, it requires temperature control. On the air radiator, it is possible to use a stainless steel aluminum finned tube, and this is not a problem. On ordinary finned tubes, the materials that can be used are mainly stainless steel, ordinary steel, copper-aluminum composite, and steel-aluminum composite. As for which one to choose, it should be determined by actual conditions and requirements.