Purcellville, VA, US
I have found from numerous makeup air installations bringing in makeup air into the return side of the heating and cooling system ductwork allows the unconditioned exterior air to be tempered before being introduced into the house. Added benefits, dedicated mechanical rooms are generally very accessible and access to the exterior from these locations is often unencumbered by finishes. We have successfully passed each and every code inspection using this method and it avoids bringing in very cold air in the winter and very hot and humid air in the summer into a room where you spend a lot of time.
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