Historical
BS EN 20140-10:1992
Acoustics. Measurement of sound insulation in buildings and of building elements. Laboratory measurement of airborne sound insulation of small building elements (British Standard)
Applies to building elements, excluding windows and doors, with an area of less than 1 m^2 and which transmit sound between two adjacent rooms or between one room and the open air independently of the adjoining building elements. Annexes A, B and C are for information only.
British Standards Institution [bsi]