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Old 02-17-2012, 07:26 AM   #1
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Furnace ductwork question


I am in the process of adding a bathroom in my basement. My issue is the furnace ductwork run directly up the middle of my space. It is possible to move the ductwork tight to one side. The problem is if I do that the very end would be at the doorway entering the other room. The duct is about 3 inches lower than the top of the door opening. Question: can I make the ductwork wider and shorter to maximize headspace and still get the same airflow upstairs? I would have a local HVAC company do the work - I just want to know if I can do this before I call them to come out. Thanks!

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Old 02-17-2012, 08:33 AM   #2
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Furnace ductwork question


In most cases yes. They can change it to rectanguler.
But someone really can give you the best ansewers if they were on site.

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Old 02-17-2012, 03:39 PM   #3
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Furnace ductwork question


I would have to see what you have there now(maybe a picture) ,but the answer is most probably.Also most probably it will be or need to be a custom fitting which isn't as big a deal as it sounds but air flow needed will be part of the design.
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Old 02-17-2012, 06:44 PM   #4
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Originally Posted by ltlbvr View Post
I am in the process of adding a bathroom in my basement. My issue is the furnace ductwork run directly up the middle of my space. It is possible to move the ductwork tight to one side. The problem is if I do that the very end would be at the doorway entering the other room. The duct is about 3 inches lower than the top of the door opening. Question: can I make the ductwork wider and shorter to maximize headspace and still get the same airflow upstairs? I would have a local HVAC company do the work - I just want to know if I can do this before I call them to come out. Thanks!
yes it will work remember your talking about a small room.. bath ..which would not require much cfm...
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Old 02-18-2012, 04:39 AM   #5
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yes it will work remember your talking about a small room.. bath ..which would not require much cfm...
he said there are other supplies to the floor above that will come off this duct. So probably can't make it smaller, and still have enough air flow.
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Old 02-18-2012, 06:45 AM   #6
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he said there are other supplies to the floor above that will come off this duct. So probably can't make it smaller, and still have enough air flow.
thanks....I thougth he was adding a duct to bath...guess I read wrong...
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Old 02-18-2012, 06:54 AM   #7
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He'll probably be adding a supply to that bath also. So you read it half right.
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Old 02-18-2012, 07:27 AM   #8
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Changing the ducting to rectangular is exactly what could be done with your situation, as long as the aspect ratio (width to height) remains within reason. From memory I believe that ratio should not exceed 5 to 1.

EDIT: After looking up the recommended duct aspect ratio, it is no recommended to exceed 3 to 1, however the length of that duct will determine system losses, a short run of 5 to 1 will not have much effect at all on the system losses.


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Last edited by Jackofall1; 02-18-2012 at 08:35 AM.
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Old 02-18-2012, 07:45 AM   #9
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8X12=6X17=5X22. 8X18=6X26=5X34.

Can make for some very wide duct work as you decrease the duct height.

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