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Totals for gross wall area : ��36 .42 <br /> * Framing area is l00 of gross wall area <br /> 13 . Gross wa11 area x factor below = U x A per code <br /> Facto7- is . 11 for A-1 single family & duplex <br /> .23 for A--2 and other residential <br /> .23 for oth�r buildings <br /> .28 for over 3 stor� ies <br /> Factor is� 0 . 11 <br /> BTUH = 527 .3554 MUST BE > OR = 436 .4� <br /> ( calculated above ) <br /> 14 . Gross ceiling area = 2110 <br /> 15 . Ceiling framing area ( 10o af ceiling area ) = 211 <br /> 15 . Jc�ist Area ( 100 of ceiling area ) = 211 <br /> 17 . Net ceiling area ( Gross ceil . area - Joist area ) = 1899 <br /> 18 . U ceiling : 0 .021 x Net ceil . area - 39 .�379 <br /> 19 . U framing = 0 .02�i x Joist area = 5 .064 <br /> 20 . Total of item 18 x item 19 = 44 .943 <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 = 54 .86 MUST BE > OR = 44 .943 <br /> ( calculated above ) <br />