Sharing cold air returns.


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Old 03-05-06, 06:33 PM
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Sharing cold air returns.

Hi. I am finishing my basement that is roughly 1000sqft. I have two rooms that I have built, one is 14X14 and the other is 11X11. My question is when I make my cold air returns can both rooms share the same stud cavity. Also if my rec room has no door just an opening, can I forget a cold air return.
 
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Old 03-05-06, 07:49 PM
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They can share the same space! If the door is under cut no return needed!
 
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Old 03-06-06, 05:25 AM
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If you are finishing 1000sq. ft. then you probably should have two cold air returns. But if it is only 317 sq.ft. that you mention then one is sufficient.
 
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Old 03-06-06, 05:43 AM
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I am essentially finishing the entire 1000sqft. I have the previously mentioned two rooms and also a bathroom and a rec room. The rec room is 30X15 and has no door, it is just an open doorway. I was under the assumtion that with an open doorway you need no cold air return. The other two rooms will have doors attached. I have read about undercutting doors before. Is this an accetable way to gain your cold air return. While I am at it the stud cavity that I want to share for both rooms will run up right below a floor joist that has been sealed off for the cold air retuns upstairs. Is there a way to just tap into this or do I have to devise something that actually attaches to the main cold air return.
 
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Old 03-06-06, 04:49 PM
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I would use a separate stud cavity for each room and add a big return to the rec room. Just my opinion.
 
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Old 03-07-06, 04:56 AM
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Agreed with Thermo. More than one return would be better for the size of the space...especially that it is in a basement.
 
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Old 03-08-06, 08:56 PM
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Why do you want call it cold? No such thing. Just call it return. And no, undercutting doors is NOT an acceptable method of proper air flow path.

http://www.buildingscience.com/resou...lle_detail.pdf
 
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Old 03-09-06, 06:56 PM
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Thanks Texas I didnt want to say it but you are right about the doorways.
 
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Old 03-10-06, 04:22 AM
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Originally Posted by TexasTech
Why do you want call it cold? No such thing.
If you live in Texas, then it may not be called a "cold" air return. But if you live in the northen US or Canada, then this is what it is called. One of its functions is to draw the cold air off the floor and send it back to the furnace. This helps to balance the air temperature in a room...especially a basement.
 
 

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