The perfect balance in door return air pathway is a grille installed into the bottom of interior doors.
Bedroom door air vent.
This removes hot and cold spots within the home improves the hvac system s performance reduces energy use improves indoor air quality and adds comfort to your living space.
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If it wasn t there and the bedroom door was closed the only way for air to return to the air handler would be through the narrow undercut slot.
It s called a transfer grille and provides an opening from the bedroom to the hallway for air to return back to the air conditioning air handler or furnace when the supply register vent in the ceiling of the bedroom is blowing conditioned air into the room.
By adding a perfect balance in door return air pathway to each of your interior doors each room is balanced allowing them to be conditioned equally.
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At the same time the return is making an extra effort to suck in enough air to cool the entire house not just the rooms with open doors.
It becomes positive relative to the main part of the house and probably also to the outdoors.
When the system is running and the bedroom door is closed the pressure in the bedroom goes up.
Some of that air will find its way under the door and through interior leaks back to the central return vent.
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