Total system airflow is difficult to measure directly; we can use flow hoods, but they have their limitations, especially on systems that have multiple returns.
Air Flow Measurement of HVAC Fresh Air Intakes
Tech Tips: Static Pressure Testing Part 2: Airflow
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HoldPeak 866B Digital Anemometer Handheld Wind Speed
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Illustration of the proposed control.
Tech Tips: Static Pressure Testing Part 2: Airflow
HVAC Air Flow_Step-by-step_TrueFlow
Understanding Capture Hood / Air Flow Hood Performance
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BTMETER BT-846A Pro HVAC Anemometer Measures Wind
Buildings, Free Full-Text