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Yes, a draft fan would be appropriate to model using the "Parasitic Electric Load" field in the Boiler:HotWater object. It is a constant electric input whenever the boiler is operating. If your boiler fan modulates so that it is a variable amount of electricity is used depending on other factors, you may be able to simulate that using the Energy Management System in EnergyPlus. I have not tried that specifically but I believe that it can be done..