Reply by AndyJ1s

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Posted on Actual numbers for comparing a long radius 90deg vs 2 45deg elbows

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471 posts in 666 days

#1 posted 09-25-2020 06:11 PM

If I understand choice 1 correctly, it has a total 135 degrees of turn, albeit in two planes, which makes no difference.

Choice 2 has only 90 degrees.

All else held equal (e.g. radius of turns), choice 2 wins.

I did a little experimenting on the freecalc ductloss calculator mentioned above, and found that, if the radius of curvature is the same between one 90 and each of two 45’s, then the total loss is identical. Go with whichever has longer radii.

-- Andy - Arlington TX

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