Noise Reduction Estimation Formula IV

As noise can be a major problem in various facilities including health care, its reduction is essential. This formula is concerned with estimating the reduction. Noise reduction is expressed by [35,36] 

APW = the total absorption properties of walls in the noise-receiving room. WA = the area of wall transmitting sound expressed in fb. p = the transmission loss of materials of varying thickness expressed in decibels. 

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