Velux Insulation Collar BDX 2000 UK04 134 x 98cm glass-roof-system Customers found the window to

Customers found the window to be sturdy and well-built

The anti-adherent material used on the lower side is polyethylene film

Choice of 5 fantastic colours

you can rest assured that this product will stand the test of time

the Velux GGL MK08 3070 centre-pivot roof window

Velux Insulation Collar BDX 2000 UK04 134 x 98cm glass-roof-system Customers found the window toFor the ultimate in insulation, we recommend the VELUX BDX insulation collar. It reduces heat loss by eliminating thermal bridges between the window and your roof structure and it also comes with VELUX BFX underfelt collar. The VELUX BDX insulation collar sits between the roof structure and the window frame and insulates the gap between the two, which reduces heat loss. The insulation collar also includes the BFX underfelt collar in the package. The