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Old 09-16-11, 09:13 AM   #15
bennelson
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Join Date: Sep 2008
Location: SE Wisconsin
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I hadn't even thought about using square tube. I guess it's just that I have access to a fair amount of round tube, old water heaters and that sort of thing.

Some square tube would be special order and cost money.

I would imagine that round would be SLIGHTLY better than square in terms of airlflow going through with less turbulence.

The other thing is that if you want to wrap soft copper pipe around the outside of a tube, square wouldn't work so well.
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