Insulation Collar for EKL / EKW for coupled installations (100mm gap).
For 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. Also comes with BFX Underfelt Collar.
- Underfelt material: frothed polyethylene, heat transfer group 040
- Collar material: polypropylene
- Material thickness: 0.5 mm
- SD value (water vapour diffusion resistance): 0.03 m
- Note: For recessed installations, a version of the BDX is now available, this is supplied with the EDN and EDJ 2000 recessed flashings