ow Voz (cfm) System Ventilation Efficiency Ey Minimum Outdoor Air I Flow Vol (elm) Design Outdoor Air Intake Flow Wm) Zone Primary Air Flour Faction Vpz (cfm) Primary Outdoor Air Fraction Zp • VozNpz % Increase Orer Standard General Office 8000 5 0.06 5 680 1.0 680 1.