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D duct diameter 4 inches <br /> duct diameter 0.333333 feet <br /> diameter squared 0. 111111 square feet <br /> Pi 3 . 141593 , <br /> diameter squared times Pi 0.349066 square feet <br /> divided by 4 0 .087266 square feet <br /> Ad duct area 0 .087266 square feet <br /> Qa2 actual flow rate(Va*Ad) 109.5962 CFM <br /> Total l nfl uent=Effluent <br /> Qat +Qa2 229 . 7699 <br />