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quantity that is use to measure the level of sound insulation provided by a structure such as a wall, window, door, or ventilator, mõõtesuurus, mis on kasutusel konstruktsiooni, nt seina, akna, ukse või ventilaatori heliisolatsiooni taseme mõõtmiseks
sound-reduction index . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/sound-reduction%20index/1/eng (20.06.2026)