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Old 09-02-2010, 12:30 PM   #1
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room door sucking shut when air is on


Hello. When my air or furnace is running and the door of the room is close to being shut, it will suck shut. It is also a cold room in the winter. Why is this? Is it because I only have one cold air return which is at the ceiling and three vents in the floor in that room? Thanks.

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Old 09-02-2010, 12:36 PM   #2
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room door sucking shut when air is on


Is it sucking shut or being pushed closed?

Does it open in or out? Most room doors open into the room, so I am imagining the door being pushed closed by the pressure from the supply registers. Am I correct?

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Old 09-02-2010, 01:04 PM   #3
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room door sucking shut when air is on


yes the door is being pushed shut because it opens into the room.
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Old 09-02-2010, 01:47 PM   #4
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room door sucking shut when air is on


The return duct for that room may be too small or possibly restricted. That would also explain why it isn't getting enough supply air to keep it the same temperature as the other rooms.

If you have access to the return duct from that room, either in the basement if you have one or possibly the crawl space, you could check for restrictions or possibly a volume damper (rare on returns). Another possibility, especially if your unit is in the attic, is a crushed run of flexible duct.

You'll have to do some detective work.
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Old 09-02-2010, 02:59 PM   #5
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room door sucking shut when air is on


so if it's not blocked then what?
Does it matter if the cold air return is in the top of the wall in the room?
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Old 09-02-2010, 03:04 PM   #6
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room door sucking shut when air is on


No, it doesn't matter, as long as it's sized correctly.
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Old 09-02-2010, 03:08 PM   #7
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room door sucking shut when air is on


Is the return air duct in that room functioning properly? Hold a piece of tissue paper close to the grill to see if it get's pulled towards it. Compare the air being pulled into that RA grill with a RA grill in a room that is more comfortable.
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Old 09-03-2010, 04:45 PM   #8
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room door sucking shut when air is on


Yes it seems to hold it to the return vent. What coud be wrong then?
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Old 09-03-2010, 05:13 PM   #9
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room door sucking shut when air is on


Could be a number of things wrong.
The problem with the door may or may not be related to the air flow in the room. It could just be that the hinges are sprung or the wall is out of plumb.
The room being cold in winter could be due to infiltration due to poor window seals or just lack of insulation. It could also be the things I mentioned earlier about poor duct design or joints having come loose.
Without being there to see for myself all I can say is keep up the detective work until you find something that may be the cause. That's exactly what a pro would do if you had them come look at it. If you can narrow it down to one or two possibilities, even if it's something you can't fix yourself, at least you will give someone a place to start.

Have you been in your attic or basement to look at the supply and return ducts?

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