What does the equivalent length of a duct fitting mean?
A) It is a factor that allows comparison of two different-diameter ducts.
B) It is the length that air will travel after it leaves a supply register.
C) It is the maximum length that any duct run may be.
D) It is the length of straight duct that would have a pressure drop equal to the pressure drop through the fitting.
D
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____ sizes are always given as the outside diameter.
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