duct booster fans
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.
By my figuring, you'd actually get closer to 36% of the original flow.
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