What is the purpose of the vent grille over the bedroom door?
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. 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 below the door. The door undercut does not provide a sufficient opening, so the room would become somewhat pressurized and would not receive as much conditioned air as rooms that had an open return air flow.
Another way to achieve good air flow in rooms with a closed door is called a jump duct. To read more about them, go to our blog What is a jump duct?
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To learn more about heating and air conditioning systems, see these other blog posts:
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