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1) To be more specific: If longer runs are required to vent to the exterior you would need larger vents and bigger fan to get that accomplished efficiently, similar to hydraulics ( movement of liquid ). Fans don't generally use that much electricity but I doubt a fan built into the micro wave would effectively push air that far down any vent. More than likely you would use a vent fan at the exterior if there was much of a run.
2) You are right about venting undesirable air out of the living environment to prevent problems the trouble is if left on it would vent more conditioned air out than you might realize. In HVAC design it is important to consider where losses occur. Take the cooling you mentioned, in a warm climate we look at things like the treatment between the bottom plates and the pad or deck. I would make sure I sealed that detail well with some kind of foam or sealant because cool air sinks and can be lost through any cracks or openings. The BTU losses are significant on untreated bottom plates and it all adds up over time and the accumulative openings. You can calculate what kind of losses you would have depending on the fan output. These issues are less important in homes where energy efficiency is not a priority.
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