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Placement Considerations

This document outlines best practices for measuring and controlling supply air (SA) and return air (RA) flow rates in air handling units (AHUs) and multi-pressure zone systems. It emphasizes the importance of monitoring airflow across critical pressure boundaries to ensure proper pressurization while allowing for adjustments to reset differentials when necessary. Additional considerations include the variability of exhaust flow rates and the impacts of fan performance changes on static pressure, ensuring efficient HVAC operation and indoor air quality.

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Placement Considerations

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  1. Measure and Control OA Intake flow rates Measure and control SA/RA flow rates at the AHU Measure and control SA/RA flow rates at each “branch”. Monitor “bleed” airflow across critical pressure boundaries to verify pressurization and reset differentials if necessary. Measure and control SA/RA flow rates into each zone on multi-pressure zone systems. Placement Considerations Measure Exhaust flow rates if a.) rates are variable or b.) changes in fan performance with static pressure will significantly impact pressurization.

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