A modified flexible sealing membrane is provided for sealing the gap between the frame of an industrial window and the rough opening in which the window is received ('building gap'). The membrane is formed from a flexible sheet defining an integral projection for receipt in an adaptor connected to the window frame. On one side of this projection, the flexible sheet defines an outer membrane portion which is wide enough to seal the building gap. On the other side of this projection, the flexible sheet defines an inner membrane portion which is wide enough to seal the gap that is often found between the different structural members which combine to form the window frame ('frame gap').
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