Reducing ductwork

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Old 01-04-07, 09:25 AM
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Reducing ductwork

I am adding a bathroom in my basement and the ductwork causes the ceiling to hang below the minimum height allowed by building code. I need to move it up 4 - 6 inches and it is 8 inches deep.

Is there any solution to this? I am guessing that installing smaller ductwork for that part of the run will mess up the airflow. What if I installed ductwork that has the same volume, but has different dimensions (flatter and wider)?

Has anybody encountered a situation like this? Any ideas?
 
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Old 01-04-07, 09:46 AM
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You dont say how big the duct you have is. Yes you can make it flatter. But it will be very wide for the sq" . Then it will pop or make noise. There are wall stacks, that is duct
3 1/4" X 10" X12" X 14"

You still need the same sq " in the duct

 
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Old 01-04-07, 10:23 AM
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The current duct is 8"X 20". The run in queston is about 8 feet and there are two branches coming off it.

Now that I think of it, it probably isn't a good idea to try and replace it. Looks like I am going to have to work around it.
 
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Old 01-04-07, 12:24 PM
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You could span that duct with 5/8 drywall Or I have used a droped ceiling. That will cost you about just 1" going under the duct. Boy you would need a 6"X27" duct for what you have there . That would go BANG every time the blower came on
 
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Old 01-04-07, 01:33 PM
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I was going ot frame it, but that leaves me with a 6'4" ceiling and a building code violation. I am trying to follow code. Maybe I will cheat this time.

I didn't know flattening a duct would go BANG.. thanks. I probably wouldn't have done it anyway. Just brainstorming.
 
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Old 01-04-07, 03:48 PM
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Frame it on each side then the dry wall can span that 20 " So it only cost you 5/8" that way
 
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Old 01-04-07, 05:40 PM
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OK, thanks... now if I can just sabotage the building inspector's tape measure
 
 

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