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I just noticed that when a template system is set up (let's say a typical AHU) and a max flow rate for the supply fan is entered, that flow rate is set to the System:Sizing object only, but the actual fan and cooling coil are set to auto-size. Obviously this ends up with the right result, but is confusing when reviewing someone else's model (what I'm doing now). Is there a reason why the expanded IDF file is create this way and the flow rate isn't just set straight into the fan?

I just noticed that when a template system is set up (let's say a typical AHU) and a max flow rate for the supply fan is entered, that flow rate is set to the System:Sizing object only, but the actual fan and cooling coil are set to auto-size. Obviously this ends up with the right result, but is confusing when reviewing someone else's model (what I'm doing now). Is there a reason why the expanded IDF file is create this way and the flow rate isn't just set straight into the fan?