23 Mar 70 mm Upvc Profiles ( 70mm pvc profil )

https://youtu.be/dK2buzzspA4   Nowadays 70 mm upvc profiles are one of the most common series. Acording to different supplier it has 5 chambers and 2,2 to 3 mm wall thickness. It is  uf values are about 1.3,-1,5 W/(m2K). Most projects which needs some u value limits, and some stability...