This standard specifies test methods, test requirements and classifications for air handling units, which are supplying and/or extracting air via a ductwork ventilating/conditioning a part or the whole of the building. This standard is not applicable to the following:a) air conditioning units serving a limited area in a building, such as fan coil units;b) units for residential buildings;c) units producing ventilation air mainly for a manufacturing process.Except for the thermal and acoustic performance of the casing, the test methods and requirements are applicable to both complete units and any separate sections.The filter bypass test is not applicable to