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 an acoustic laboratory because it represents real conditions. We work with an associate acoustic engineer to provide testing to the site testing standard in our laboratory, as well as to the laboratory testing standard in his lab.