Permanently Closing An Air Vent In The House - HVAC - DIY Chatroom Home Improvement Forum

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Old 05-14-2008, 10:30 AM   #1
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Permanently closing an air vent in the house

I am currently doing a small home renovation project and there maybe a need to permanently close an air vent in the living room (there are two and I only need one as the room is small). I am thinking of taking out the grill and just installing a pre-cut cardboard in place of the air vent and shut it permanently.

Has anyone ever done something like this before? Any negative impact to the Heat/AC system as now there is less venting of the Heat/AC air than maybe what the system was designed for. There are still plenty of other air vents which will be left open though (more than 12).


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Old 05-14-2008, 04:18 PM   #2
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It depends on your system's design...Ducts, AC unit size, etc. It will affect the static pressure for sure, but that may or may not be a good thing. If your AC unit was already oversized for your duct system, closing 1/12th of it off could be a bad thing. If it was perfectly sized, I doubt you'll see too much negative effect.


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Old 05-17-2008, 06:29 AM   #3
oops, did I do that!
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In any room you should have two vents...a supply, positive pressure...and a return, negative pressure. If the vent you are going to block off is the return, negative pressure, you may be creating problems.
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