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The BFX Underfelt Collar creates a tight connection between your roof window frame and underfelt. The Transverse Drainage Gutter ensures that any water from above the window can drain away safely. *Protects against drafts and wind driven rain and snow around the window. *Underfelt collar comes pleated in one piece for easy fitting around window corners and roof battens. *Suitable all roofing constructions in roof pitches between 15º and 90º, with or without battens. *Can be used for both ventilated and unventilated roof structures. *Underfelt: special diffusion polypropylene. Drainage gutter: galvanised steel.
