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clayman 11-10-2010 11:30 PM

Duct Routing
 
I am planning to put a bonus room in my basement. The area where I am planning on putting it has two ducts passing through it, serving registers on the first floor. Here is the plan, showing the walls I want to put up and the current duct locations.

http://images107.fotki.com/v71/photo...uestion-vi.jpg

Here, you are looking at where I'd like the door into the room to be. That wall is running parallell to the joist. The walls are 7' so head room is at a premium.

Obviously, I need to change how these ducts are routed. One duct branches directly off the main stack on top of the furnace, the other is off the central distribution duct.

The joists are 2x9's running left to right in the picture. There are cross braces between the joists which prevent me from moving the duct fully up into the joists, so there will be about 2" inches below the joist.

The rear duct I think can stay where it's at. I'll just move it up into the joists as much as possible and then just build a soffit to conceal what sticks out below the joist.

I am looking for suggestions about the front duct.

Option 1
I am thinking about routing it around the room. This will require changing the 45 turn coming out of the furnace into a 90 and adding another 90 turn to pass in front of the room.

Option 2
The second option is to run both ducts through a soffit at the back of the room and then turn 90 and run the front one up to it's register.

Is either option a good idea? Is there a better option?

beenthere 11-11-2010 04:35 AM

If you run around the room, and use 90's. Then the duct should be increased in size, to the next size larger. So that you don't lose/lessen air flow to that room.

clayman 11-11-2010 08:18 AM

Quote:

Originally Posted by beenthere (Post 532383)
If you run around the room, and use 90's. Then the duct should be increased in size, to the next size larger. So that you don't lose/lessen air flow to that room.

I assume that size increase will require cutting a larger hole in the source duct. Or, can a setup-up collar just off the central distribution duct accomplish this. I think the current duct is 6", so hopefully there is a larger standard size and accompanying step-up collar.

beenthere 11-11-2010 05:48 PM

Need to cut a larger hole in the plenum.

7" is the next size up from 6.


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