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262 CHAPTER 18 1960 Guide Cqcrf*. Ungrti of fitting* end (tgiihrt Table 10----- Capacity and Sizing Table--Second Story For Warm Air and fafarn Air 5tod:, Broach, and togitton Horizontal bngfli Fvraacm to Register Second Story Room Hecf lo--Bhd> CoL a Up to 70 Eq Ft CoL b Up to 7 8-12 13-17 18-25 26-35 36-45 46-55 71 to-lOOEq Ft Up to 7 8-12 13-17 18-25 26-35 36-45 46-55 101 to 130 Eq Ft Up to 7 8-12 13-17 18-25 26-35 36-45 46-55 131 to 165 Eq Ft Up to 7 8-12 13-17 18-25 26-35 36-45 46-55 . 166 to 200 Eq Ft KAtmuiu&itoD 1\ limber Up to 7 8-12 -13-17 18-25 26-35 36-45 46-55 CoL e Up to 5 6-0 10-13 14-18 19-25 26-35 36-45 46-55 Up to 5 6-9 10-13 14-18 19-25 25-35 36-45 46-55 Up to 5 6-9 10-13 14-18 29-25 26-35 36-45 46-55 Up to 5 6-9 10-13 14-18 19-25 26-35 36-45 46-55 Up to 5 6-9 10-13 14-18 19-25 26-35 36-45 46-55 Stacks*: No. (in paren.) and Size Rectangular Branch Size Round Branch Size (Diana) Number of Joist 8paces and Minimum DepthReturn Air Registers: Low Wall, High Wall or Baseboard: Registers: Floor, Warm Air Registers: Floor, Return Air Trunk Duet Increase, Inches CoL d 6,300 5,700 5,200 4.800 4.100 3,500 3.100 2.800 CoL e 10,900 10,000 9,200 8,500 7,300 6,400 5,600 5,000 CoL f 14.000 13.000 12,100 11,400 10.000 8,800 7.800 6.800 CoL B 17.000 15.900 14.900 13.900 12,400 11,100 9.900 9.000 21,800 20,000 18,400 17.000 14,600 12,800 11,200 10.000 28,000 26,000 24,200 22,400 20,000 17.600 15.600 13.600 70.000 65.000 60,500 57.000 50.000 44.000 39.000 34.000 5.000 4,600 4.300 4.000 3,400 3.000 4,700 2.300 9,000 8,200 7,600 7,100 6,200 5,400 4,700 4,200 11,900 11,000 10,300 9,600 8,400 7,500 6,700 6,000 14.800 13,900 13,000 12,200 10.800 9,600 8.500 7.500 18,000 16.400 15.200 14.200 12.400 10,800 9.400 8.400 23,900 22,000 20,600 19,200 16,800 15.000 13,400 12.000 59.500 55.000 51.500 48.000 42.000 37.500 33.500 30.000 4,200 3,900 3,700 3,500 3.000 2,600 2,400 2.000 7.700 7.200 6.700 6.200 5,400 4.700 4,100 3,600 10.400 9,700 9,000 8.400 7.400 6,500 5.800 4.800 13,000 12,100 11.300 10,600 9.400 8.300 7.400 6,500 15.400 14.400 13.400 12.400 10,800 9.400 8,200 7,200 21,700 19,400 18,000 16,800 14,800 13,000 11,600 9,600 52,200 48,400 45.300 42.300 37.000 32,500 29.000 24.000 3.800 3,500 3,200 3,000 6,800 6.300 5.800 5,500 9,100 8.400 7,900 7.400 11.400 10,500 9.800 9.200 13.600 12.600 11,600 11,000 18,200 16,800 15.800 14.800 45.500 42,000 39,600 36.800 2,700 2,300 1,900 1.800 4.800 4,200 3,400 3.300 6.300 5,700 4,500 4.300 8,100 7.200 5.800 5.400 9.600 8,400 6,800 6.600 12,600 11,400 9,000 8,600 32.200 28.200 22.800 21.500 3.500 3,200 2.900 2,700 6,100 5,700 5,300 5,000 8,200 7,600 7.100 6.700 10.300 9.500 8,900 8.300 12,200 11,400 10,600 10,000 16.400 15.200 14.200 13.400 41.000 38,300 35.800 33,400 2.500 2,100 1.900 1.500 41 4.400 3,900 3.400 2,800 42 5.700 5.100 4.500 3.500 43 7,400 6.500 5,800 4,700 44 8,800 7.800 6.800 46 11.400 10.200 9,000 46 (1) 10x3)4 (1) 10x3)4 (1) 12x3)4 (1) 14x3)4 (2) 10x3)4 (2) 12x3)4 29.000 25.800 22.800 47 _ 3x8 5 4x8 6 5x8 7 6x8 8 8x8 10x8 15x8 9 10 12 1 at 3 1 at 3 1 at 4 1 at 5 1 at 6 or 1 at 7 or 1 at 9 or 2 at 3 2 at 4 2 at 5 10x6 10x6 12x6 14x6 2)10x6 or 2)12x6 or (1) 24x6 (1) 30x6 - 8x10 8x10 9x12 9x12 or longer 10x12 12x14 - 6x10 or 4x14 6x10 or 4x14 6x12 or 6x14 6x14 6x30 6x30 8x30 i 2 3 4 5 7 12 The limiting Uetor tor dost cnjnhmmtinn i th t~V ;y ! i i i Warm Air Heating Systems Table 11.... Selection of Bonnet Temperature, Register Temperature and Register Delivery (CFM)-6 (For BwiMcg* Having a Heel tots between 120,000 aad 350,000 BTV/Hri Register Delivery Vokni in CfM per 1000 BfU per Hr. 263 Bonnet f 10 20 30 40 50 50 70 80 90 100 110 120 130 140 150 160 170 ISO 190 200 210 220 230 240 22.1* 120 18.4 130 15.9 108* 107 106 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 90 89 89 88 88 87 23.1* 23.6 24.2 25-4 28.0 26.6 27.3 28.0 28.8 29.6 30.5 31.5 32.3 33.3 34.6 35.9 37.3 38.6 38.6 39.9 39.9 41.3 41.3 42.7 118 116 114 112 111 109 108 106 105 103 102 101 100 99 98 97 96 95 94 93 92 91 90 90 19.0 19.6 20-3 21.1 21.6 22.5 23.1 24.2 24.8 26.0 26.6 27.3 28.0 28.8 29.6 30.5 31.5 32.3 33.3 34.6 35.9 37.3 38.6 38.6 u128 126 123 121 119 117 115 113 111 110 108 107 105 104 103 102 101 99 98 97 96 95 93 16.4 16.9 17.6 18.1 18.7 19.3 20-0 20.7 21.6 22.1 23.1 23.6 24.8 25.4 26.0 26.6 27.3 28.8 29.6 30.5 31.5 32.3 33.3 34.6 140 14.0 137 134 131 129 126 124 122 120 118 116 114 112 110 109 107 106 105 103 102 101 100 99 98 97 14.6 15.1 15.7 16.2 16.9 17.3 17.9 18-4 19.0 19.6 20.3 21.1 22.1 22.5 23.6 24.2 24.8 26.0 26.6 27.3 28.0 28.8 29.6 30.5 150 12.6 147 143 140 137 134 131 129 127 124 122 120 118 116 114 112 110 109 107 106 105 103 102 101 100 12.9 13.5 14.0 14.6 15.1 15.7 16.2 16.6 17.3 17.9 18.4 19.0 19.6 20.3 21.1 22.1 22.5 23.6 24.2 24.8 28.0 26.6 27.3 28.0 160 11.4 156 152 149 145 142 139 136 133 130 128 126 123 121 119 117 115 113 112 110 108 107 106 104 103 11.8 12.3 12.7 13.2 13.7 14.2 14.8 15.3 15.9 16.4 16.9 17.6 18.1 18.7 19.3 20.0 20.7 21.1 22.1 23.1 23.6 24.2 25.4 26.0 170 10.5 166 161 157 (153 150 146 143 140 137 134 131 128 126 124 122 120 118 116 114 112 no 109 107 106 10.8 11-3 11.7 12.2 12.6 13.1 13.5 14.0 14.6 15.1 15.7 16.4 16.9 17.3 17.9 18.4 19.0 19.6 20.3 21.1 22.1 22.5 23.6 24.2 180 9.7 175 170 166 161 157 153 150 146 143 140 137 135 131 128 126 124 122 120 118 116 115 113 111 no 10.0 10.5 10.8 11.3 11.7 12.2 12.6 13.1 13.5 14.0 14.6 14.9 15.7 16.4 16.9 17.3 17.9 18.4 19.0 19.6 20.0 20.7 l21.6 22.1 190 9.1 184 179 174 169 165 160 156 153 149 145 142 139 136 133 130 128 126 124 121 119 117 115 113 112 9.4 9.8 10.1 10.6 10.9 11.4 11.8 12.2 12.7 13.2 13.7 14.2 14.7 15.3 15.9 16.4 16.9 17.3 18.1 18.7 19.3 20.0 20.7 21.1 200 8.6 193 187 182 176 171 167 163 158. 154 151 147 144 140 138 135 132 129 127 125 122 120 118 116 114 8.9 9.2 9.6 9.9 10.4 10.7 11.1 11.6 12.1 12.4 12.9 13.4 14.0 14.4 14.9 15.5 16.2 16.6 17.2 17.9 18.4 19.0 19.6 20.3 1 Register temperature, Fahrenheit. (Uee upper value in eaeh croup.) * Re*ister delivery volume in cubic feet per minute per KDQ Btu. (Dee lower veloe in each group.) Refato delivery volumes in 1 era tor ten lescth of duet. in the structure. The calculation of these losses is explained in Chapter 12. 2. Location of registers and return intakes on floor plan, showing types of registers, with distance from register to op posite wall and deflection of registers desired. 3. Laying out a proposed duct system for both warm air and return air sides of the system, and including details of types of fittings and the actual and equivalent lengths of each branch line from bonnet to register, without sizes. (See Fig. 7, Groups 1 through 6, for equivalent length of fittings.) 4. Determination of bonnet temperature. If the rating sheet for a furnace-blower unit specifies a fixed polite of bonnet temperature, find this temperature in the left-hand column of Table 11. If not specified, use the following procedure: Use Tabic 11 for buildings having a heat loss be tween 120,000 and 350,000 Btu per hr, or Table 12 for buildings having a heat loss greater than 350,000 Btu per hr. Select short est actual length, including vertical risers and read downward in nearest column in Tables 11 or 12 until lower heavy diagonal line is reached, but do not cross line. Run horizontally to first column of table and note bonnet temperature. Also select long est actual length including vertical risers, and read downward in nearest column in Tables 11 or 12 until upper heavy diagonal line is just crossed. Run horizontally to left to obtain value for bonnet temperature in first column. Select as the design bonnet temperature any value between these two limits. 5. Determination of air volume to be delivered through each register and the respective register air temperatures. Using Tables 11 or 12 and the design bonnet temperature selected, find the values of cfm per 1000 Btu for each duct length, and the corresponding register temperature. 6. Selection of register sizes and pressure losses to produce necessary throw, for the air volumes handled. Use Tables 13 or 14 to obtain required free area and pressure loss of register. 7. Design of duet system. A. Warm air branches. a. Use Table 15 to select maximum bonnet pressure usually required for the trunk carrying the maxi mum volume of air (cfm). If the maximum bonnet pressure is not high enough to accommodate.the Eressure loss through the registers, use a higher^ onnet pressure. If the register pressure is critically large, it may be necessary to reduce it by either using two registers in place of one, or using smaller defection angles. b. Obtain actual duct loss by subtracting total register fressure loss, as determined from Tables 13 or 14, rom maximum bonnet pressure, c. Obtain the pressure drop in each duct per 100 ft us ing the following equation: Pressure drop per 100 ft Actual Duct Loss X 100 Total Equivalent Length d. Determine duct size by means of air friction chart