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� . <br /> Page 10 <br /> ONE- dz TWO-FAMILY RFSIDENTTAL I3UILDING PRESC:RIP'TIVE (COOK-BOOK) <br /> APPROAC�� <br /> MAXIMUM WINDOW AND DOOR AREA AS A PERCENT OF OVERALL WALL <br /> AREA <br /> From Minn. Rules part 7670.0475, subpart 2, item F <br /> Cavit Window U-Factor <br /> Framin Insulation Sheathin 0.49 0.36 0.31 0.27 <br /> STANDARD R-13 > R - 7 13.4% 17.8% 21.3% 24.3% <br /> STANDARD ' R-13 > R - 5 12.4% 16.4% 19.7% 22.5% <br /> STANDARD R-15 > R - 5 12.9% 17.1% 20.1% 23.4% <br /> STANDARD R-18 < IZ - 5 12.1% 16.0% 18.8% 22.0% <br /> STANDARD R-18 > R - 5 14.0% 18.6% 21.8% 25.3% <br /> /\DVANCED R-18 < R - 5 12.9% 17.1% 20.1% 23.4% <br /> ADV,AN.�ED R-18 > R - 5 14.5% 19.2% 22.5% 26.1% <br /> -'��' STANDARD �`� R-21 < R - 5 12.8°/ 7.0% 19.9% 23.1% <br /> �� ° �3% 22.5% 26.1% <br /> �=. --S�=� � ' D R-21 > R - 5 14.5 /o <br /> ADVANCED R-21 < R - 5 13.6% 18.1% 21.2% 24.6% <br /> ADVANCED R-21 > R - 5 15.0% 19.9% 23.2% 26.9% <br /> Additional calculated values <br /> STANDARD R-17 < R - 5 11.9% 15.7% 18.4% 21.5% <br /> STANDARD R-17 > R - 5 13.8% 18.4% 21.5% 25.0% <br /> ADVANCCD R-17 < R - 5 12.6% 16.8% 19.6% 22.9% <br /> A.DVANCED R-17 > R - 5 14.3% ?9.0% 22.2% 25.7% <br /> Notes: <br /> Window area equals rough openiitg minus installation clearances. <br /> Window U-factor must be determined by either the National Fenestration Rating <br /> Council standard 100-91, or ASHRAE 1993 Handbook of Fundamentals, Chapter 27, <br /> Table 5. <br />