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Insulation collar (also includes BFX underfelt collar). VELUX BDX - Insulation collar Insulates around the roof window frame therefore reducing heat loss and eliminating cold bridges Makes insulating and installing the window a simple and quick process Click fittings ensure a quick and accurate assembly Includes BFX collar, see below BFX- Underfelt collar Ensures a weather-tight seal between the roof window and the roof Pleated material ensures a flexible and tight seal to the underfelt of the roof, whatever it's construction Made from diffusion open material to minimise the risk of condensation Comes with transverse drainage gutter to lead water away from the head of the window if a tile or slate is broken above the window Welded corners ensure a watertight and simple installation Please note the VELUX BDX insulation collar cannot be used with EDN or EDJ recessed flashings.