This standard applies to centrifugal multi-blade blowers (hereinafter referred to as blowers) that are driven by V-pelts and driven directly by an electric motor, and whose blade diameters range from 160 mm to 1600 mm, and which are mainly used for ventilation and ventilation in buildings. Specifies what is used for harmonization. However, this does not apply to blowers with noise-reducing boxes, and does not include those built into packaged air cables, fan coil units, etc. The gas to be handled is air at -15°C to +40°C.