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The VELUX BDX Insulation Collar insulates around your roof window frame, reducing heat loss and eliminating cold bridges. Together with pleated BFX Underfelt Collar, it forms a tight seal to your roof structure. *Prevents heat loss *Made of flexible foam for secure fit *Click fittings ensure fast and accurate assembly *Water drains safely via the self-supporting drainage gutter *Made to all standard window sizes *For use with recessed EDJ or EDN flashings.
