What friction rate should be used to size a duct for a design friction rate of 0.12 in WC if the duct has a total equivalent length of 150 ft?
A) 0.1 in wc because that is the standard factor B) 0.12 × (150/100 ) = 0.12 × 1.5 = 0.18 in WC
C) 0.12 × (100/150 ) = 0.67 × 0.12 = 0.08 in WC D) 0.12 in WC because the duct length is irrelevant
C
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