Where is return supply air coming from?

668 Views 7 Replies 4 Participants Last post by beenthere, May 19, 2016

johnd9

Discussion Starter · May 17, 2016

I just installed 12x6 air return grill above the bedroom door. Since my doors only have 1/2 inch opening om the bottom, I thought the 12x6 grill will increase air flow from the bedroom and it will make it cooler when doors are closed. Well, the draft through the grill is barely noticeable, I was expecting a bit more.
So, I assume the return air is coming from other rooms, but they have same 1/2 inch space on the bottom door. Checking by hand I only feel faint draft at the bottom, when doors are closed.

My AC is new 3T with 20x20x1 filter, in family room with windows and 3 bedroom doors. There is no return duct system, the return air supply is directly below the AC drawing ari from family room.

Is there way to discover where is the return air coming from? Garage doors and front doors seem to be working very well as nothing is coming through the sides, cracks, same for windows, I don't feel any wind coming in.

Is there way to discover where is the return air coming from?

John D.

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johnd9

Discussion Starter · #3 · May 17, 2016

Yes, AC is in the closet with louvers, so it's getting air through there. It's almost 30 years old house with original windows, so I was trying to find a 'leak' that would be sucking air around the windows so I can pinpoint and fix the leak. Didn't find anything. The AC guy did lower the fan (lower?) speed so it's quieter AC, I assume this doesn't mean he lowered the air intake, too...?

I read that in some houses when you almost close the bedroom doors you could feel the pressure trying to close the door. Not in my house and thought I would have all these leaks around windows, but couldn't find any.

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johnd9

Discussion Starter · #4 · May 17, 2016

And of course, the reason I put the grill on top of the bedroom door is that it is the hottest room in the house and we need to cool the whole house so we can sleep with closed doors. Tonight will be the first night with the grill, but as said, it doesn't seem to be pulling much air out the room with new grill.

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johnd9

Discussion Starter · #6 · May 18, 2016

Thank you, will look into the cost of this test.

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