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404.2 Average Outdoor Air Fraction
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The average outdoor air fraction (Xs) for the ventilation system shall be determined in accordance with Equation 404.2.
Xs = Vou/Vps
The uncorrected outdoor air intake (Vou) shall be determined in accordance with Section 403.5.3, and the system primary airflow (Vps) shall be determined at the condition analyzed. [ASHRAE 62.1:A1.1]
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