Document G6MLY4K6aRv7YKyXbrrOjood4

1406 CHAPTER 22 1946 Guide Table 3. ' Capacity Tables for Warm-Air and Return-Air Branches*1* ' FIRST STORY For UNINSULATED Metal Ducts Section A. 40 to 69 Equivalent ACTUAL LENGTH from bonnet to boot) or. FROM RETURN PLENUM TO BOOT) IN FEET 1 TO 7 FT Col. a 8 TO 12 FT Col. b 13 TO 17 FT Col. c 18 TO 24 FT 1 Col. D 25 to 34 FT Col. e 35 to 44 FT Col. f 45 to 54 FT Col. c 55 to 64 FT . Col. h Warm Re Air Combi turn Air .Combi nation No. nation No. 7200 6700 6100 5600 4800 4100 3500 12500 11700 10800 9900 8500 7400 6400 16000 15000 14000 13000 11300 9900 8700 19100 18000 17000 16000 14200 12500 11000 3000 5500 7700 9600 41 42 43 44 51 52 53 54 Fittings and Register 25000 23400 21600 19800 17000 14800 12800 11000 - 45' 32000 30000 28000 26000 22600 19800 17400 15400 46c 80000 75000 70000 65000 56500 49500 43500 38500 55 56 57c Section B. 70 to 99 Equivalent Ft 5500 5100 4800 4500 3900 3400 9900 9200 8600 8100 7100 6200 13100 12300 11600 10900 9700 8500 16300 15400 14500 13700 12200 10800 3000 2600 5400 4600' 7500 6500 9500 .8300 r 19800 18400 17200 16200 14200 12400 10800 9200 26200 24600 23200 21800 19400 17000 15000 13000 65500 61500 58000 54500 48500 42500 37500 42500 41 42 43 44 45c 46c 51 52 53 54 55 ' 56 57c Section C. 4400 4200 3900 3700 3200 2900 2600 2300 41 51 8100 7600 .7100 6600 5800 5100 4500 4000 42 52 100 to 139 10800 10100 9600 9000 8000 7100 6200 5400 43 53 Equivalent . 13700 12900 12100 11300 10000 8900 7900 7000 44 . 54 16200 15200 14200 13200 11600 10200 9000 8000 21600 20200 19200 18000 16000 14200 12400 10800 54000 50500 48000 45000 40000 35500 31000 27000 45c 46c 55 56 57c Section D. 3900 3700 3500 3300 2900 2500 2200 2000 6900 6500 6100 140 to 189 9300 8700 8100 Equivalent '' 11600 11000 10400 Ft 5700 7600 9800 5100 6800 8700 4500 6000 7700 4000 5300 6800 3600 4700 6000 13800 13000 12200 11400 10200 9000 8000 7200 18600 17400 16200 15200 13600 12000 10600 9400 . 46500 43500 40500 38000 34000 30000 26500 23500 Section E. 190 to 250 Equivalent' 3300 5700 7800 9700 3100 5400 7300 9100 2900 5100 6900 8600 2700 4800 6500 8100 2500 4300 5700 7300 2200 1900 380ft 3400 5000' 4400 6500 5800 1700 3000 3900 5100 41 42 43 44 , 45c 46? 41 42 43 44. 51 52 53 54 . 55 56 57c 51 52 53 54- 11400 10800 10200 9600 8600 7600 6800 6000 15600 14600 13800 13000 11400 10000. 8800 7800 39000 36500 34500 32500 28500 25000 22000 19500 45c 46c 55 56 57c For INSULATED Ducts Col. a Col. b Col. c Col. d Col. e Col. f i TO 9 FT 10 TO 17 FT 18 TO 24 FT 25 to 34 Ft 35 to 55 to 54 FT ' 74 FT For ducts that are COM- PLETELY INSULATED WITH V4 IN. THICK .INSULA- tion from Bonnet to Boot. use these column headings. - "These tables are for use in sizing both the warm air and the return air branches. ^Frictional resistances and temperature drops in ducts have both been accounted for in these tables. "Use these items only when the building construction, or capacity requirements, necessitates the use of two adjoining stacks or floor registers. *_ 1 Mechanical Warm Air Systems 407 Table 4. .Capacity Tables for Warm-Air and Return Air Branches^ SECOND STORY For UNINSULATED Metal Ducts a/"*tTTAT I FNirTIT (FROM BONNET TO BOOT) OR. A ^ n (FROM RETURN PLENUM TO BOOT) IN FEET 1 TO 7 FT 8 TO 13 TO 18 TO 12 FT 17 FT 24 FT 25 to 34 FT 35 to 44 FT 45 TO 54 FT 55 to 54 FT Warm Air Combi nation No. Re- v TURN Air Combi nation No. COL. A Col. b Col. c Col. d Col. e Col. f- Col. g Col. h Section A. 40 to 69 Equivalent Ft for Fittings and Register 6300 5700 5200 4800 4100 3500 10900 10000 9200 8500 7300 6400 14000 13000 12100 11400 10000 8800 17000 15900 14900 13900 12400 11100 3100 5600 7800 9900 2800 5000 6800. 9000 41 42 43 44 21800 20000 18400 17000 14600 12800 11200 10000 ,45c 28000 26000 24200 22400 20000 17600 15600 13600 46c 70000 65000 60500 57000 50000 44000 39000 34000 51 52 53 .54 55 56' 57c Section B. 70 to 99 Equivalent Ft 5000 4600 4300 4000 3400 9000 8200 7600 7100 6200 11900 11000 10300 9600 8400 14800 13900 13000 12200 10800 3000 5400 7500 9600 2700 4700 6700 8500 2300 41 4200 -.42 . 6000 . 43' 7500 44 18000 16400 15200 14200 12400 10800 9400 8400 23900 22000 20600 19200 16800 15000 13400 12000 59500. 55000 51500 48000 42000 37500 33500 30000 45c 46c 51 52 53 54 55 56 57c Section C. 4100 3800 3600 3400 2900 2600' 2300 2000 7400 6900 6400 6000 5200 4600 4000 3600 100 to 139 . 10000 9300 8700 8100 7100 6200 5500 .4800 Equivalent 12500 11600 10800 10100 9000 8000 7200 6500 Ft 14800 13800 12800 12000 10400 9200 8000 7200 20000 18600 17400 16200 14200 12400 11000 9600 50000 46500 43500 40500 35500 31000 27500 24000 41 42 43 V 44; 45c 46c 51 52 53 54 55 56 57c Section D. 140. to 189 Equivalent Ft 3700 3400 6500 6000 8600 8000 10900 10100 3100 2900 5600 5300 7500 .7000 9400 8800 2600 4700 6100 7800 2200 4100 5400 6900 2000 3700 4800 6100 1800 41 3300 42 4300 43 5400 ' 44. 51 52 53 54 13000 12000 11200 i0600 9400 8200 7400 6600 17200 16000 15000 14000 12200 10800 9600 8600 43000 40000 37500 35000 30500 27000 24000 21500 45c . 55 46c 56 ' 57c Section El ' 3200 2900 2700 2500 2200 1900 1700 1500 5500 5200 4800 4400 3900"1 3400 3100 2800 190 to 250 7300 6800 6300 5900 5100 4500 3900 3500 Equivalent 9100 8500 7900 7500 6600 5900 5200 4700 Ft 11000 10400 9600 880b 7800 6800 6200 5600 14600 13600 12600 11800 10200 .9000 7800 7000 36500 34000 31500 29500 25500 22500 19500 17500 41 42' 43 44 51 52 53 54 45c ' 55 46c 56 57c For INSULATED Ducts Col. a I TO 8ft Col. b 9 TO 14 FT Col. c ; Col. d Col. e 15 TO 21 to 20 ft- 27 FT 28 to 42 FT. Col. f Col. g For ducts that are COMPLETELY IN SULATED WITH 43 to 55 to . IN. THICK INSULATION 54 FT 70 FT from Bonnet to Boot use these column headings. These tables are to use in sizing both the warm air and the return air branches. ^Frictional resistance and temperature drops in ducts have both been accounted for in these tables. "Use these items only when the building construction, or capacity requirements, necessitates the use . of two adjoining stacks or floor registers.