Determine the equivalent diameter of the following ducts: a. 12 in 12 in b. 18 in

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Determine the equivalent diameter of the following ducts:
a. 12 in × 12 in
b. 18 in × 12 in
c. 24 in × 12 in
d. 30 in × 12 in
e. 48 in × 12 in

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