China 'GB/T 34877.3-2017
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 34877.3-2017
Industrial fans—Determination of fan sound power levels under standardized laboratory conditions—Part3:Enveloping surface methods 工业风机 标准实验室条件下风机声功率级的测定 第3部分:包络面法
Issued Date:2017-11-01
Implemented Date:2018-05-01
Issued by:
The Standardization Administration of the People's Republic of China