Whilst STC and SRC indicate how perfectly noise passes as a result of diverse elements, NRC (Noise Reduction Coefficient) steps how well components prevent sound from reflecting (how much sound they could absorb). The NRC is the percentage of sound that a surface area absorbs (To paraphrase, hits a surface https://elliottyaaba.buyoutblog.com/31984509/top-latest-five-thermal-performance-urban-news