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TABLE 304.1 <br /> COMBUSTION AIR REQUIREMENTS FOR GAS-FIRED <br /> APPLIANCES WI•IEN THE COMBINED INPUT IS UP TO <br /> AND INCLUDING 400,000 Btu/hr <br /> TurF APPLIANCES, RGQUI►{Ep FREE AREA OF <br /> A 1QUL PUT OS OF[3ttr/hrAIR-SUPPLY ACCEPTABLE E APPROXIM <br /> (kW) OPENING QR DUCT,SQUARE INCHES ATE ROU <br /> Nd DtlCT <br /> (sq mm) EQUIVALENT(mm) 'fEKt, <br /> 7.5------(�� <br /> INCH(mm) <br /> ``�0(:15} • 7(4,500) -----------IT - <br /> ---— --- _ <br /> 75(23) 7(4,500} 3 (75) <br /> l <br /> 100(30) 1J (7,000) 3(75) <br /> 125 (37) 14 0),000) (zoo) <br /> 150(45) 18(12,000) 4 (100) <br /> 175 (53) 22 (14,000) 5(125) <br /> 200 (ro} 25(1 6,000)(azs) <br /> 225 (68) 29(�`�,Ooa) <br /> 6(a`i0) <br /> 2 20(75) 32 (21,000) G(:1.50) <br /> 275 (83) 36(23,000) fii(:150) <br /> 300(90) 40(26,000) 7(:175) <br /> 325 (98) 43(28,000) 7(:176) <br /> 15(.)(:10?,) 47(30,000) 7(17_"r) <br /> :375 (:10 ) 50(32,000) 8(l0U) <br /> _400(1 zo) 54 (35,000) i3(zoo) <br /> I. Fur total inputs fallingbetween listed capacities, '�tj37100) <br /> ....______________-_____L____( 8(200) <br /> 2. II flexible duct is Used, increase the duct diameter by <br /> use next inch. <br /> 't listed inlrut ----- (225) <br /> "`Flexible duct shall be stretched with minimal sags. <br /> one ittclt. `r <br /> BTU Amount for Nun-direct vent appliances <br />