ʻO kahoʻopaʻa leoʻO ka coefficient NRC ma luna o 0.5, hiki ke hoʻonui i ka hana o ka hale, hoʻomaikaʻi i ke ʻano acoustic o ka hale, a hoʻomaikaʻi i ka maikaʻi o ke ola o nā kānaka.He kūpono ia no nā hana ʻoihana e like me nā hale keʻena, nā hōkele, nā halemai, nā panakō, nā ʻaha hoʻokolokolo, nā kula a me nā ʻoihana ʻē aʻe, nā corridors lehulehu, nā suites kiʻekiʻe, nā hale ʻoihana, nā papa, nā lumi hana, nā lumi hoʻokolokolo a me nā papahana ʻoihana ʻē aʻe, a me nā lumi hoʻokipa, nā keʻena, nā lumi hālāwai a me nā wahi ʻē aʻe i hoʻonani nani.

Noise reduction coefficient ʻO NRC kahi helu loiloi piha e ana i ka hiki ke hoʻoheheʻe leo o kekahi mea i loko o kahi wahi pani.ʻO ke kiʻekiʻe o ka NRC, ʻoi aku ka liʻiliʻi o ke kani i hōʻike ʻia i ke ākea.ʻO ka mea ʻē aʻe, ʻike mau ʻia ke kani i ka lewa e hana i ka reverberation, ka hopena i ka walaʻau hope.Ma muli o ka ʻike o ka pepeiao o ke kanaka, aia wale nō ke piʻi ka NRC i ka 0.5 a ʻoi aʻe paha, hiki i ka pepeiao o ke kanaka ke manaʻo i ka emi nui o ka walaʻau.Ua hōʻike ʻia nā hoʻāʻo ʻana i nā kino hoʻopaʻa leo hui ʻia, e like me nā panela hulu hipa mineral hoʻopaʻa leo, a me nā panela metala me nā ʻāpana hope hoʻoheheʻe i ka leo maʻamau.ʻO nā panela hoʻoheheʻe kani e like me ka papa gypsum porous ʻole, ka papa silicate calcium a me ka papa metala ʻaneʻane ʻaʻohe hopena kani.ʻAʻole hana maikaʻi nā panela hoʻoheheʻe kani porous e like me nā papa gypsum perforated no nā kani haʻahaʻa.

He mea koʻikoʻi ka NRC noise reduction coefficient no nā wahi i hoʻopaʻa ʻia.Pono e noʻonoʻo ʻia ka manawa kani a me ka nui o ka walaʻau ma nā kaiapuni aʻe:

1. Keena pani, lumi halawai
2. Wehe/paʻa hui keʻena ʻoihana
3. Lobby, wahi hana
4. lumi papa/a'o, hale ha'uki, hale 'aina
5. Kaiapuni lapaʻau, e like me: hale hoʻokipa, lumi kūkākūkā, keʻena kauka, etc.
6. Kaiapuni kūʻai, kaiapuni lawelawe mea kūʻai aku, etc.