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equals <br /> Totals for net wall: 1517. 174 0.043 65.24 <br /> Totals for gross wall area: 249.92 <br /> * Framing area is 10$ of gross wall area <br /> 13. Gross wall area x factor below = U x A per code <br /> Factor is . 11 for A-1 single family & duplex <br /> .23 for A-2 and other residential <br /> .23 for other buildings <br /> .28 for over 3 stories <br /> Factor is: 0. 11 <br /> BTUH = 288.1076 MUST BE > OR = 249.92 <br /> (calculated above) <br /> 14. Gross ceiling area = 1594 <br /> 15. Ceiling framinq area (10$ of ceiling area) = 159.4 <br /> 16. Joist Area (10$ of ceiling area} = 159.4 <br /> 17. Net ceiling area (Gross ceil. area - Joist area) = 1434.6 <br /> 18. U ceiling: 0.021 x Net ceil. area = 30.1266 <br /> 19. U framing: 0.024 x Joist area = 3.8256 <br /> 20. Total of item 18 x item 19 = 33.9522 <br /> 21. Gross ceiling area x factor below = U x A per code <br /> Factor is .026 for A-1 single family & duplex <br /> .033 for A-2 and other residential <br /> .06 for other buildings <br /> Factor is: 0.026 <br /> BTUH = 41.444 MUST BE > OR = 33.9522 <br /> (calculated above) <br />