In the event of hurricanes or man-made events causing high wind velocities and flying debris, a window or door material fabric is removably installed to protect the frangible elements of the openings and unsuitably protected portions of the envelope. The barrier has retainers fastened on opposite sides of an opening with a flexible material fabric extending between the retainers. Alternatively, the barrier can be secured directly to the structure providing envelop protection to the structure.
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