What adjusted friction rate should be used to size a duct for a design friction rate of 0.1 in WC if the duct has a total equivalent length of 75 feet?
A) 0.1 in WC because the duct length is irrelevant
B) 0.10 × (75/100 ) = 0.10 × 0.75 = 0.075 in WC
C) 0.10 × (100/75 )= 0.10 × 1.33 = 0.133 in WC
D) The friction rate cannot be determined with the information given.
C
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