what percentage area increase did you use when going from 4" round to square.
why did you use 2 90 degree bends instead of a 45 or minimal resistance gentle curve
nice job though
Member
what percentage area increase did you use when going from 4" round to square.
why did you use 2 90 degree bends instead of a 45 or minimal resistance gentle curve
nice job though
Senior Member
The cross section of the wide and flat areas have the same surface area as a 4" round circle. This was done to not restrict airflow as much as possible . The reason for the tight bends is to get the duct up and out of the way of the table (and any clamps) as soon as possible. Had I done a gradual angle I would have increased the area that I couldn't use clamps.
It performs great and I have no doubt that a slightly smoother curve would be a little better ... But I can't imagine it would be that much.
I could just print another duct....
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