Source google image: https://img.yumpu.com/24061657/1/358×507/300-standard-le-meilleur-coefficient-disolation-cobosystems.jpg?quality=85
Isolation westfalia
Source google image: https://img.yumpu.com/24061657/1/358×507/300-standard-le-meilleur-coefficient-disolation-cobosystems.jpg?quality=85