AEEDL-004 complies with the GB/T 21087-2020 standard, accurately measures the core parameters of the fresh air unit, such as air volume, enthalpy exchange efficiency, and temperature and humidity exchange rate, supports 100-5000m³/h air volume testing, and can be equipped with world-class sensors (such as Honeywell and Vaisala). It is compared by a national laboratory before delivery (data deviation < 1%), providing authoritative data support for the research and development and quality inspection of fresh air systems.