scope:

This part of ISO 140 gives a laboratory method of measuring airborne sound insulation under diffuse field conditions of such small building elements as are defined below. It is intended that the results obtained will be used to develop building elements with appropriate acoustical properties, to classify such elements according to their sound insulation properties and to estimate their influence on the sound insulation of partition constructions in buildings. This part of ISO 140 applies to building elements, excluding windows and doors, with an area of less than 1 m² and which occur in a certain number of discrete sizes with well-defined lateral dimensions and which transmit sound between two adjacent rooms or between one room and the open air independently of the adjoining building elements. Some examples of equipment covered by this part of ISO 140 are trasfer devices, airing panels (ventilators), outdoor air intakes, electrical raceways (cable ducts) transit sealing systems.