combustion air intake can I change to square tube?


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Old 02-19-13, 10:17 AM
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combustion air intake can I change to square tube?

I have a furnace in a closet space, and the combustion air intake is a 10" round tube running at the base of the furnace to the exterior wall it takes up some 25" with the elbow and all. Can i exchange this with a box to the outside saving me 15 " of space?
 

Last edited by stickshift; 02-19-13 at 11:54 AM. Reason: removed duplication of question
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Old 02-19-13, 11:48 AM
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Yes, but that "box" or rectangular duct will need to have a cross-sectional area of at least 78 square inches so it might not give you as much additional space as you think.
 
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Old 02-21-13, 10:14 AM
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How tall can I make It

So can I make the rectangular duct taller to fit inthe space and give it adequate air?,Name:  WP_000617.jpg
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Old 02-21-13, 05:16 PM
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Eight by ten is a standard duct size & would give you 80 sq.in.
 
 

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