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Old 10-27-2012, 04:45 PM   #1
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Cold Air Supply Design


To start with, I am a CPA, not a thermodynamic expert.

I am finishing off my mostly unfinished basement. My basement currently has a 6" cold air supply. From past dealings with HVAC guys, I was told to put the end of the supply in a five gallon pail, leaving an inch or two space to the bottom, to keep the cold air from just rushing into your house (I am in Minnesota).

The cold air supply comes into my house in a good spot (one positive surprise in the buildout). It comes into the house and runs down the block wall exactly where I am going to frame in 12" at the head (where the supply lines are) of the bathtub. I can put a 90 degree turn at the bottom and put it into the utility room which is right thee but think this would let in too much cold air. I can:

1. Run the cold air supply away from the outer wall at the floor two feet and then run it upwards two feet before I pop into the utility room. Will this "U" trap the cold air?

2. I can leave the cold air supply line in the five gallon pail in the framed in area and put a vent on the wall to this framed in area. A bit hack, but would that work?

Any other suggestions?

B

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Old 10-27-2012, 09:23 PM   #2
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Cold Air Supply Design


If your chasing it in with water lines in the same chase. insulate it and the water lines so you don't have them freezing up.

Just run it into the utility room, and 0 it up once in that room.

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Old 10-28-2012, 10:50 AM   #3
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Cold Air Supply Design


Quote:
Originally Posted by beenthere View Post
If your chasing it in with water lines in the same chase. insulate it and the water lines so you don't have them freezing up.

Just run it into the utility room, and 0 it up once in that room.
It will be inside from the 2x4 framed and insulated (1" XPS plus unfaced R13) outer wall so freezing is not an issue.

Not sure what you mean by run into the utility room and zero out. I am going to have a 6" 90 degree HVAC piece as the end going to a vent opening to the utility room.

I believe entering the house in the rim joist, dropping 8 feet to the floor and turning 90 degrees and entering the utility room will let in too much cold air. What I am asking is will creating a "U" at the bottom trap the cold air and keep it from rushing in?

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Old 10-28-2012, 11:29 AM   #4
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Cold Air Supply Design


Yes, a U/J will slow down/prevent excess cold air from coming in.
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Old 10-28-2012, 07:06 PM   #5
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Cold Air Supply Design


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Originally Posted by beenthere View Post
Yes, a U/J will slow down/prevent excess cold air from coming in.
Thanks, I didn't want to build the whole thing and find out that it wasn't the case and cold air was rushing in.

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