Thermal Dispersion Airflow Measurement is an analytical tool used to accurately measure the rate of air flow through a duct. This measurement involves using temperature sensors placed along the length of the duct, which measure the thermal dispersion caused by the passage of air. This method is highly accurate and repeatable and can be used to measure air flow in both conditioned and unconditioned spaces. It is widely used in commercial and industrial applications to ensure optimal occupant comfort and to comply with building regulations.