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1-2025_Chinese: Testing and calculating methods for seasonal performance factor of energy recovery ventilators for outdoor air handling - Part 1: Seasonal performance factor of sensible heating recovery (Chinese: 热回收新风机组季节性能系数测试和计算方法 第1部分：供热显热回收季节性能系数)
English versions: GB/T 45233-2025
English versions: GB/T 25936
English versions: GB/T 13963-2025
English versions: GB/T 16844-2023
GB/T 20250-2006 Chinese PDF (GB/T20250-2006) GB/T 45509-2025 1-2025_Chinese: Testing and calculating methodsGB T 20250 2006_Chinese: Aluminium and aluminium alloys continue extruded tubes (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 20250 2006
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