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Placement Considerations

This detailed guide covers essential techniques to measure and control supply (SA) and return (RA) airflow rates at the air handling unit (AHU) and each branch in HVAC systems. It emphasizes monitoring "bleed" airflow across critical pressure boundaries to verify proper pressurization and adjust differentials when necessary. The guide also discusses considerations for exhaust airflow rates, especially in scenarios with variable rates or changes in fan performance that impact overall pressurization. This knowledge is vital for efficient HVAC operation.

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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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