Sound insulation (acoustic performance) laboratory tests, were performed at the IFT Rosenheim Institute For Window Technology, Rosenheim, Germany and their results are summarized below:
The sound insulation rendered by a window, is expressed in decibels (db) by the noise reduction coefficient Rw.
It is indicatively noted, that noise levels for a silent library, a quiet room and a busy street, are at 30, 40 and 70-80 db respectively