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If the MUA comes from another source, it would be unheated.
To be practical and a direct-replacement, the input and output air would have to use the existing ductwork that has been framed in.
This could be achieved by using a split vent which also provides some heat exchange, however:
-the effective conduite would be cut in half,
-the inlet air would be heated in the summertime,
-on the exterior, the two sides would probably need to be located far away from each other to conform to code. This may require an ugly and large attachment.
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