What method is utilized to verify airflow in a duct system?

Using a flow hood is an effective way to measure airflow in a duct system because it provides a direct and quantitative method for assessing the volume of air moving through the ducts. A flow hood is designed to capture the exiting airflow from a vent and measure it accurately, typically in cubic feet per minute (CFM). This measurement is crucial for ensuring that the ventilation system operates as intended, meets design specifications, and provides adequate air distribution throughout the space.

Measuring airflow with a flow hood allows commissioning technicians to evaluate the performance of HVAC systems, identify any discrepancies in airflow rates, and make necessary adjustments or repairs to ensure optimal performance. This method gives a clear, hands-on approach for technicians to confirm that the designed airflow is being achieved, making it indispensable in the commissioning process.

Other methods mentioned, such as visual inspection, thermal imaging analysis, and pressure differential measurement, may provide useful information about the duct system but do not offer the same level of precise airflow quantification as a flow hood does. Visual inspection can indicate obvious issues like leaks or blockages, thermal imaging can identify temperature differences due to airflow issues, and pressure differential measurement can indicate potential airflow problems but cannot measure the actual volume of air.