Question: Figures 5 - 2 7 to 5 - 3 1 in the Fittings Handout from Principals of HVAC depict different branch conditions from rectangular main

Figures 5-27 to 5-31 in the Fittings Handout from Principals of HVAC depict different branch
conditions from rectangular main duct. For a condition where 50% of flow entering goes into
the branch, and air velocities in the main duct and in the branch are the same, which of the 5
fittings would result in the least branch pressure drop? What other fitting in this group
provides very similar results, and comment on why it might be chosen instead.
Figures 5 - 2 7 to 5 - 3 1 in the Fittings

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