Source google image: https://www.franciaflex.com/medias/FX-fx/public/Catalogue%20Produits/Photos/Fenetres%20et%20Coulissants/Fenetres%20ALU/z%20Equipements%20et%20accessoires/FOCUS%20ZOOM%20ME%20ALU43.jpg
Isolation phonique 10/16/4
Source google image: https://www.franciaflex.com/medias/FX-fx/public/Catalogue%20Produits/Photos/Fenetres%20et%20Coulissants/Fenetres%20ALU/z%20Equipements%20et%20accessoires/FOCUS%20ZOOM%20ME%20ALU43.jpg