is described in astm e 1996 the standard specification for performance of exterior windows glazed curtain walls doors and storm shutters impacted by wind borne debris in hurricanes written by the american society of testing and materials herein incorporated by reference preferably the material of the panel 22 is a high density polyethylene or polypropylene material the material of the panel is preferably translucent allowing partial transmission of exterior light through the panel and into the building polymeric materials used to construct the panels may include additives to provide resistance to flame water and exposure to ultra violet light the panels are provided in a variety of lengths dimension d 1 and widths dimension d 2 to allow accommodating a variety of openings as may be appreciated from fig1 and 2 the length height d 1 of the panels must be sufficient to span the height of the window w while the cumulative width d 2 of the panels and bridge members must span the width of the opening the length of width of the panels also includes an effective overlap allowing the panels to rest against the surface of building to provide sufficient support in addition the effective overlap provided by the length and the width of the panels compared to the corresponding dimensions of the opening provides sufficient overlapping area to accommodate the hardware 24 for mounting the panels to the building the panels may be provided in sizes for covering a single window or in sheets of that can be cut into panels for two or more windows by providing the panels in sizes consistent with common window sizes cutting operations may be eliminated providing the material.