A better alternative is to use a simple heat exchanger for a small
amount airflow, but supply outside air for things like fireplaces,
furnaces, and hot water heaters.
My brother used to build houses, and always put in outside air to the
front of the fireplace, leaving a slot on the front face just behind
the opening. Saves a fortune in wasted conditioned air if you have
good glass doors.
You also need a proper vapor barrier, else the house goes bone dry.
Peter
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