TEST #4 REVIEW

4.5 x CFM x (Change in Enthalpy) or (Total CFM ÷ 400) Area of a rectangular Duct= L x W ÷ 144 . ... Where CFM = Cubic feet/minute A =. Area in sq. ft. V = Velocity in feet/minute AK = Factor used with outlets; actual unobstructed airflow Total Pressure Formula. ................
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