WHAT IS THE NOISE REDUCTION COEFFICIENT?NRC is an average rating of how much sound an acoustic product can absorb. (How much quieter a product can make your space.)Examples such as sponges that absorb water, acoustic products absorb sound and the NRC tells us how much sound the product can absorb.SCALE :The NRC rating ranges from 0 to 1. NRC 0 means the product does not absorb sound. NRC 1 means the product absorbs all sound. The higher the NRC, the better the product at absorbing soundProduct thickness and density are two factors in NRC. Suppose an acoustic product with an NRC rating of 0.95 means that 95% of the sound in the room is absorbed, while the other 5% is reflected.