... diameter is Dϭ (2) (10 .25 )( 13) / (10 .25 ϩ 13) ϭ11.45 ft (3. 5 m)ϭ 137 .3 in (34 8.7 cm). Duct friction is then psϭ[0. 03( 9)/ 137 .3 1 .24 ]( 127 5/ 1000)1.84ϭ0.000 934 inH 2 O (0. 23 Pa). Velocity ... 76 .3 (22 .4) 101.6 (29 .8)Exhaust gas flow, lb/ h (kg / h) 1 52, 000 (69,008) 1 53, 140 (69, 526 ) 154 ,33 0 (70,066)155,570 (70, 629 )Exit gas temperature,ЊF(ЊC) 31 9 (159) 28 5 (141) 2 73 ( 134 ) 26 9 ( 1 32 )Fuel ... 110,467 ft 3 /min ( 52. 1 m 3 /s), with an outlet velocity of 4400 ft /min (22 .4 m /s), an outlet velocity pressure of 1 .21 0 inH 2 O (0 .30 kPa), a speed of 122 2r/ min, and an input hp of 25 5.5 bhp...