0 237 u00d7 480 113 76 pounds added for a total of 175 06 pounds this number should be substituted into the above formula to give a more accurate calculation of deflection for example an 8 foot barrier could deflect 10 9 u2033 when allowing for a 115 mph wind factor rather than 9 7 u2033 if the wind was not factored in the deflection of a 40 foot barrier becomes 80 28 u2033 6 69 u00b0 rather than 47 u2033 3 9 u00b0 if the window is not necessary to salvage deflection is not of concern as the fabric material will prevent loss of envelop integrity the fabric must be anchored in a suitable manner so as to absorb the loads without being torn from its support while various hardware devices may be used to anchor the fabric in place general criteria include stainless steel screws or nails 13 with sufficient pull out strength in both wood and concrete to withstand the stress created by the material fabric 11 these criteria are merely exemplary and not limiting other anchoring hardware may be used to install the protective barrier of this invention in fig1 a manufactured window 14 for use in new construction or as replacement in existing structures is shown the frame 15 is of a size to fit into a standard sized opening in a structure such as a house or.