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Fireplace area 6 0 . 17 1 .02 <br /> Exposed Found. 161 .47 0 . 08 12 . 92 <br /> * Framing area 399 . 74 0 . 095 37 . 98 <br /> equals <br /> Totals for net wall : 2487 . 6741667 0 . 043 106 . 97 <br /> Totals for gross wall area : 412 . 08 <br /> * Framing area is l00 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 = 439 . 714 MUST BE > OR = 412 . 08 <br /> (calculated above) <br /> 14 . Gross ceiling area = 2193 . 5 <br /> 15 . Ceiling framing area (l00 of ceiling area) = 219 . 35 <br /> 16 . Joist Area (l00 of ceiling area) = 219 . 35 <br /> 17 . Net ceiling area (Gross ceil . area - Joist area) = 1974 . 15 <br /> 18 . U ceiling: 0 . 021 x Net ceil . area =41 . 45715 <br /> 19 . U framing: 0 . 024 x Joist area = 5 . 2644 <br /> 20 . Total of item 18 x item 19 = 46 . 72155 <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 = 57 . 031 MUST BE > OR = 46 . 72155 <br /> (calculated above) <br />