Abstract: The energy efficiency of the AC ventilation fan is tested according to the requirements of the GB 32049-2015 standard. Factors such as testing equipment, testing environment, testing methods, and testing personnel have a greater impact on the ventilation fan air flow test and energy efficiency test. The essence of uncertainty is caused by the level of measurement technology and the ability of testers. Through the evaluation of the uncertainty of the ventilation fan energy efficiency value measurement, it is found that the differential pressure of the nozzle of the air volume test device and the size deviation of the nozzle are the main influencing factors. The laboratory can learn from these two factors, analyze each aspect, formulate corresponding improvement plans and quality control plans, and improve the relevant testing capabilities and test accuracy of the laboratory.

Key words: Air volume, Energy efficiency, Uncertainty, Ventilating fan