40.20 DIS ballot initiated: 12 weeks Dec 15, 1988
CEN
CEN/TC 126 Acoustic properties of building elements and of buildings
European Norm
The prestandard specifies field methods for measuring the sound insulation properties of façades under particular acoustical conditions and for determining the protection afforded by the façade to the occupants of the building
IN_DEVELOPMENT
ISO/CD 140-5:1978
40.20
DIS ballot initiated: 12 weeks
Dec 15, 1988