|Noise Reduction Rating NRR||27dB|
|Standards||EN 352-2:1993 / EN-24869-1:1993|
Average Product Rating: 1based on 1 reviews
Almost Useless but shipping was promptMonday, September 19, 2011
It simply does not reduce the noise level much. Certainly not 27 db.
It was inexpensive and delivered to me promptly
It could reduce noise levels