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I think Frame Conductance here really is just the conductance of the frame per square meters. Maybe it's just me, but when I see conductance, I usually think about thermal conduction inside a single material, represented by k [W/mK], but since the unit of Frame Conductance here is W/m2K this just probably means, that when overall heat transfer is calculated, e+ calculates it with the heat flux density, instead of heat flux. It is most accurate, if you use a value calculated by Berkeley Lab WINDOW as it said in the InputOutputReference.

In this case the high value of 500 W/m2K may be used, because the frame in question is very thin and made of metal, like an old industrial steel framed window.