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I keep seeing reference to 7 degree duct
divergence, and the carpenter in me can't figure out how you place a typically
straight-sided protractor against a curve to measure it. anyone
know? seems to me something is missing, such as "per inch" so that the
curve can be broken down into a series of small triangles.
I also thought a 7 degree duct was a
simple straight sided duct with sides that diverge at a 7 degree angle
from the centerline. Maybe I'm more confused than I though :
-)
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