GB 29995-2024 Chinese PDF GB/T 45220-2025 GB/T 20236-2025_Chinese: Accelerated outdoor weathering

GB/T 20236-2025_Chinese: Accelerated outdoor weathering test methods for nonmetallic materials using concentrated natural sunlight (Chinese: 非金属材料的聚光加速户外暴露试验方法)

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 2941-2025

English versions: GB/T 33223-2024

English versions: GB/T 45374-2025

GB 29995-2024 Chinese PDF GB/T 45220-2025 GB/T 20236-2025_Chinese: Accelerated outdoor weatheringGB 29995 2024_Chinese: Norm of energy consumption per unit production of coal based activated carbon and semi coke (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB 29995 2024