We were the first to introduce acoustic testing on curtain wall mock-ups. It seems like an obvious opportunity to check this important quality, but as far as we are aware it had not been done before. It does require some small modifications to the chamber because it has to have adequate volume, so is necessarily deeper, but also the construction of the chamber has to have better acoustic performance than the sample we are testing- to eliminate Flanking sound. We believe that the test we do on full size specimens using the site testing standards is superior to the test done on a small sample in acoustic laboratory because it represents real conditions. The testing is done through an associate acoustic engineer.