40.20 DIS ballot initiated: 12 weeks Jul 15, 1988
CEN
CEN/TC 126 Acoustic properties of building elements and of buildings
European Norm
The prestandard defines a method whereby the frequency dependent valves of airborne sound insulation can be converted into a single number characterizing the acoustical performance. It applies to façades, façades elements, windows, doors, roofs
IN_DEVELOPMENT
ISO 717-3:1982
40.20
DIS ballot initiated: 12 weeks
Jul 15, 1988