This standard specifies the energy efficiency level, energy efficiency limit values, test methods, and technical requirements of ventilation fans. This standard applies to general purpose centrifugal fans, general purpose axial fans, centrifugal induced draft fans for industrial boilers, centrifugal fans for power station boilers, axial fans for power station boilers, centrifugal fans for HVAC, and forward multi wing centrifugal fans. This standard does not apply to ducted ventilators, box ventilators, volute free centrifugal ventilators, and other purpose and special structure ventilators for air conditioning. The following normative references are essential for the application of this document. For all cited documents with issue 8, only the dated version applies to this document. The latest version (including all modification orders) of any referenced document without H period is applicable to this document. GB/T1236 Performance Testing of Standardized Air Ducts for Industrial Fans GB/T3235 Basic Types, Dimensions, Small Parameters, and Performance Curves of Fans GB/T 10178 Field Performance Testing of Industrial Fans JB/T 2977 Industrial Fans Terminology of blowers and compressors JB/T 4357 Centrifugal induced draft fans for industrial boilers JB/T 4358 Centrifugal fans for power plant boilers JB/T4362 Axial flow fans for power plant JB/T7221 Centrifugal fans for suction air conditioning JB/T9068 Forward multi wing centrifugal fans JB/T 10562 General purpose axial flow fans Technical conditions JB/T 10563 General purpose centrifugal fans Technical conditions 3 Terminology and definitions GB/T 1236 The terms and definitions defined in GB/T 3235JB/T 2977 and the following apply to this document. 3.1 Minimum allowable values of energy efficiency for fans The minimum allowable values of energy efficiency for fans are allowed under the standard testing conditions. 3.2 The device composed of the unit plant driver and ventilation fan
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