China 'GB/T 21229-2007
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 21229-2007
Acoustics - Determination of sound power levels of noise from air-terminal devices,air-terminal units,dampers and valves by measurement in a reverberation room 声学 风道末端装置、末端单元、风道闸门和阀噪声声功率级的混响室测定
Issued Date:2007-11-14
Implemented Date:2008-05-01
Issued by:
The Standardization Administration of the People's Republic of China