VELUX BFX 1000 Underfelt Collar Size (w x h):FK06 (66 x 118 cm) allowing rain and dirt to

allowing rain and dirt to drain away

if purchased as an add-on

Protects your roof window all year round with a sturdy aluminium shield exterior

Size: FK08 - 66 x 140 cm

Including underfloor heating systems

VELUX BFX 1000 Underfelt Collar Size (w x h):FK06 (66 x 118 cm) allowing rain and dirt toDescription: The VELUX BFX underfelt collar includes a transverse drainage gutter ensures a fast connection between the VELUX roof window and the roofing felt membrane. It helps to protect against drafts and wind driven rain and snow around the window installation. It comes as one piece making fitting easy, especially around the corners. The transverse drainage gutter included also prevents any water ingress around the roof opening caused by missing