TURTLE wrote:
...

This is Turtle.

For every 90 degree elbow you put in a duct work, it restricks 1/27 th
of the air moving through it. Put 27 -- 90 degree elbow in a ductwork
line and it will be a plugged up air ductand no air will move through
it.

TURTLE

Actually it will be 36.096% of the air will be going through. See a
elbow by elbow account below. :-)

0.962963
0.927298
0.892953
0.859881
0.828034
0.797366
0.767834
0.739395
0.71201
0.68564
0.660245
0.635792
0.612244
0.589568
0.567733
0.546705
0.526457
0.506959
0.488182
0.470102
0.45269
0.435924
0.419779
0.404231
0.38926
0.374843
0.36096


--
Joseph Meehan

Dia duit