Document DGrKVDndYpg2nRLgnmmOezNk5

456 CHAPTER 19 1953 Guide) Table 7. Warm Air Capacity, Btuh Delivered Second'Story Registers- `ActuXl Length (Bonnet to Boot) Feet Combina tion No. ' 6 4 6 8 10 12 14 16 18 61$ 4 6 8 10 12 14 . 16 18 .20 7 4 6 8 10 12 14 16 18 20 22 7H 4- 6 8 10 12 14 16 18 .20* 22 24 11 or 22 .. 12 or 24 - 14 .15 16 1 . 11 or 22 JL2 or 24 14 ' is ; ' 16 ... 2 ,11 or. 22 12 or 24 ' 14 ' 15 ... 16 , 3 11 or 22 12 or 24 - 14 . 15 , 16 4 11 or 22 12 or 24 14 . . 15 . ,M 5 .. t 8,370 8,140 7,900 7,670 7,430 7,190 6,950 6,710 6.470 6,240 6,000 ,9 10,040 9,760 9,470 9,190 8,900 8,620 8,330 8,050 7,770 7,480 7,200 11,710 11,380 11.05C 10,720 10,390 10,060 9,720 9,390 9,060 8,730 8,400 16.20C 15,750 15,300 14,840 14,380 13,920 13,460 13,000 12,550 12,100 11,640 .1 18,920 18,390 17,850 17,310 16,780 16,240 15,710 15,180 14,640 14,100 13,570 .a -- "o '! . o o ** & m. a a B u t3 .7,940 7.720 7,500 7,280 7,050 6,830 6,600 6,370 6,1501 5,930 5,700 9,540 9,270 9,000 8,730 8,460 8,190 7,920 7,650 7,380 7,110 6.840 11,120 10,810 10,500 10,180 9,870 9,550 9,230 8,920 8,610 8.290 7,980 15,400 14,970 14,530 14,100 13,670 13,230 12,800 12,360 11,930 11,500 11,070 17,980 17,470 16,960 16,450 15,950 15,430 14,830 14,420 13,910 13,400 12,890 7,530 7,320 7,110 6,900 6,680 6,470 6,250 6,040 5,830 5,620 5,400 9,030 8,780 8,520 8,270 8,010 7,750 7,500 7,240 6,990 6,730 6,470 10,530 10,240 9,940 .9,650 9,350 9,050 8,750 8,450 8,160 7,860 7,560 14,580 14,180 13,780 13,370 12,950 12,530 12,120 11,710 11,300 10,890 10,480 17,040 16,550 16,070 15,580 15,110 14,620 14,140 13,660 13,180 12,700 12,210 7,120 6,920 6,720 6,520 e;3io 6,110 5,900 5,700 5,500 5,300 5,100 8,530 8,290 8,050 7,810 7,570 7,330 7,080 6,840 6,600 6,360 6,120 9,950 9,670 9,390 9,110 8,830 8,550 8,260 7,980 7,700 7,420 7,140 13.780 13,390 13,000 12,610 12,220 11,830 11,440 11,050 10,670 10,280 9,890 16,080 15,620 15,170 14,710 14,260 13,810 13,350 12,900 12,440 11,980 11,530 6,700 6,510 6,320 6,130 5,940 5,750 5,560 5,370 5,180 4,990 4,800 8,040 '7,810 7,580 7,350 7,130 6,900 6,670 6,440 6,220 5,990 5,760 9,370 9,110 8,850 8,580 8,310 8,050 7,780 7,510 7,250 6,980 6,720 12,970 12,600 12,240 11,870 11,500 11,140 10,770 10,400 10,040 9,680 9,310 15,140|14,710 14,280 13,850 13,420 13,000 12,570 12,140 11,710 11,280 10,850 it. ^otes-' When floor registers are used on second story rooms, include the equivalent elbow resistance for the cross-over connection as shown in Fig. 2. `,, Combination Numbers 21 and 23 as shown in Tables 2 and 3 are composed of narrow stacks for narrow stud spaces. For Combination No. 21, the capacities are the Btuh deliveries shown for Combination Nos. 11 or 22 multiplied by 0.83. For Combination No. 23, the capacities are the Btuh deliveries shown for Combination Nos. 12 or 24 multiplied by 0.83. , Standard work sheets to facilitate design according to the recommended procedure, are available from iVPM.7/ & ACA. Table 8,. Return Air--Carrying Capacity--Btuh Serviced *'Return ,Aib Com bination' ih- No. Duct Diam. In. - Type A BTUH Types B and C BTUH Type D BTUH Type E BTUH Type F BTUH Return Air Com bination No. , 31 , 10 32 12 11,300 16,300 9,500 13,700 ' 7,800 11,300 5,000 7,200. 7,800 11,300 31 '32 33 V 34 14 22;200 16 : 29,000 18,700 24,400 15,300 20,000 '9,800' 12,800 15,300 20,000 33 34 ' 35 36 18 36,700 30,800 25,300 16,200 -25,300 20 45,300 . 38;000 31,300 20,000 31 ,-300 35 36 37 ' 38- 22 54;800 46,000 37,800 24,100 37,800 24 65,200 54,800 45,000 28,700 45,000 37 38 Gravity-Warm Air Systems 457 Up to 30' Joist Space ^ Wtien hath Joist space and sjoore Jot/ re os*d ,With or Wittieut Taper-*. Some as Type E. except that col lar aod-shoe are streamlined as in Type A. Type t Typt F Note: For Types C, D, E, and F return-air systems, reduce the carrying capacities shown in Table f by 1 percent for each 4 ft additional length in the horizontal run. Fig. 5. Typical Arrangements op Return-Air Duct Systems Design of Extended Plenum Systems The extended plenum system of gravity warm air heating employs horizontal ducts in the basement leading from an enlargement or extension of the customary plenum to the risers which distribute the conditioned air to the various rooms. . Extended plenum gravity systems have been satisfactorily designed and installed in small compact houses where the heat losses do not exceed 65,000 Btuh. The dimension from the floor to the bottom of the joists should in every case be at least 7 ft. To design such a system the-procedure is the same as for the conventional system already described in this chapter. It is understood;that the length of leader pipe is measured from the register to the furnace; For takeoffs, use standard fittings designed for i mw RrnrA.'i -..i'i R ROOM Ll gr ' * jj TRANSITION-*? STORAGE ROOM FRUIT ROOM L.>j1r-a. . * UNHEATED - 2 } fi AS. 1 INSULATE 11 | REG. BOX . ^rj\ %' ^ipWcE^XT^**' ->^INING . >,ROOM ' ni| -- T-TT^O\ TROOITIOR -------- I LMN6 WTCHEN 1 ROOM , 1 room i { H 2 AS. jj . R.A. Fio. 6.. Typical Basement Line Drawing