Definition of hot oil equipment in equipment layout

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In equipment layout, there are often disputes regarding the identification of hot oil equipment (i.e., equipment whose operating temperature is above the auto-ignition point of the medium). The situations encountered are as follows: For heat exchangers, the types and temperatures of the media in the tube side and shell side vary; it is said that the determination should be based on the temperature of the medium in the shell side, but no standard basis for this can be found. Another example: the tube side fluid is a medium with a temperature above its auto-ignition point, whereas the shell side fluid is a liquefied hydrocarbon medium that does not have such a temperature. How to define it. Towers: The temperature at the bottom of the tower is indeed higher than the auto-ignition point, or above 250°C, but the temperatures in the middle section and at the top of the tower do not exceed this level; in fact, the medium at the top of the tower is already in the form of liquefied hydrocarbons. Therefore, it is necessary to consider separately the impact on the ground where the structures adjacent to the tower are located, the upper-level equipment, and the distance between the tower and these structures. I hope the experts can offer some guidance; thank you. Additionally, there is also a minor issue regarding equipment layout; experts are requested to provide answers for that as well. As follows: Regarding the distance between the auxiliary equipment of the heating furnace and equipment containing flammable media, there is a claim that it should be half of the distance from the heating furnace itself, but no evidence for this can be found. Another theory is that it is necessary to determine whether the blowers and exhaust fans are explosion-proof; if they are not, should they then be treated as ignition sources? For explosion protection, should it be treated as regular equipment? So, under which category of medium is smoke considered?