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CBECC-Com does not currently model ventilation systems for residential spaces and models them using two 'ZoneInfiltration:DesignFlowRate' objects on each zone to account for it. It obviously means that fan power and any conditioning by an additional system is not accounted for all that accurately. There is a discussion here and here that highlight some of the issues. You could perhaps pass along the second link to the plan checker where it says "Residential System are to be definited with no explicit outside air ventilation"