This air volume measurement system is used to measure the circulating air volume of fans, and can also be applied to the research and testing of fan air volume for various other household electrical appliances. The laboratory complies with the requirements of the international standard ISO and the national standard GB. The air volume measurement system adopts the principle of the obstruction-type flow measurement method to measure the circulating air volume. The circulating air volume of the fan under test is determined by measuring the static pressure difference before and after the standard flow nozzle.