BS ISO 20189-1. Acoustics. Screens furniture and single objects intended for interior use. Rating of sound absorption and sound reduction of elements based on laboratory measurements— 36 стр.
Acoustics. Screens, furniture and single objects intended for interior use. Rating of sound absorption and sound reduction of elements based on laboratory measurements. Part 1: Rating of sound absorption and sound reduction of elements based on laboratory measurements— 38 стр.
