Benjamin you probably don t need to worry about excessive pressures if your only air flow into the bedroom is from the ventilation system.
Bedroom door ventilation.
What is the purpose of the vent grille over the bedroom door.
When you turn it on the fan s back acts as a vacuum suctioning or pulling air from the window through the room and out.
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As long as you have a half inch undercut at the door your ventilation air should be able to make it back to the return.
You also can create cross ventilation or airflow by opening a second nearby window such as one in an adjoining room or a room across a hall.
Friday july 27 2018 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.
Set a fan near the room s doorway but facing out of the room.
Insufficient clearance between doors and floors can cause or exacerbate poor ventilation.
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That s something that should be checked during commissioning though.