Document oDNajL78vq5K4kDoXZYLXonD8

474 CHAPTER 20 1953 Guide Table 8. Determination of Free Area and Total Pressure Loss of Register for No Deflection of AiRabiC'd*e Register Free Air in Square Inches (Upper value in each group) Pressure Loss in Inches of Water Column (Lower value in each group) CFM Distance from Register to Opposite Wall jp-21|22-24|25-27[28-30131-34| 35-30 | 40-49 lb 190*-209 62 47 37 30 24 18 0.02 0.03 0.01 0.06 0.09 0.15 210-229 76 58 45 36 29 ' 22 0.02 0.02 0.04 0.05 0.08 0.12 230-249 69 53 43 34 26 0.02 0.03 0.04 0.07 0.11 250-269 81 63 50 40 31 0.02 0.03 0.04 0.06 0.09 21 0.18 270-299 93 73 59 47 36 24 0.02 0.02 0.03 0.05 0.08 0.16 300-339 95 77 61 46 32 0.02 0.03 0.04 0.06 0.12 340-379 120 97 77 59 40 0.02 0.02 0.03 0.05 0.10 CFM 660-699 Distance phom Rsozsteb to Opposite Wall 35-89|4(M9| 60-60 160-69 70-79 180-89 i 1)' 210 143 95 69 49 0.02 0.03 0.07 0.12 0.22 . 700-739 236 160 107 77 54 0.02 0.03 0.06 0.11 0.21 740-779 263 179 119 86 61 0.02 0.03 0.06 0.10 0.18 780-819 291 198 132 95 67 0.02 0.03 0.05 0.09 0.17 820-859 320 218 -145 105 74 0.02 0.03 0.05 0.08 0.15 860-899 352 240 160 115 81 0.02 0.02 0.04 0.03 0.14 900-939 385 262 175 126 89 0.01 0.02 0.04 0.07 0.13 380-419 119 95 73 50 0.02 0.03 0.04 0.08 940-979 419 285 190 137 97 0.01 0.02 0.04 0.07 0.12 420-459 149 114 88 60 0.02 0.03 0.04 0.07 980-1019 455 309 206 0.01 0.02 0.04 148 105 0.06 0.11 460-499 171 136 105 71 0.02 0.02 0.03 0.06 1020-1059 493 335 223 161 0.01 0.02 0.03 0.06 113 0.11 500-539 160 123 84 0.02 0.03 0.05 1060-1099 '530 361 241 173 123 0.01 0.02 0.03 0.06 0.10 540-579 186 143 97 0.02 0.02 0.05 65 47 0.09 0.17 1100-1139 571 388 258 0.01 0.02 0.03 186 0.05 132 93 0.09 0.17 580-619 213 164 111 74 54 0.02 0.02 0.04 0.08 0.15 1140-1179 416 277 199 141 100 0.02 0.03 0.05 0.08 0.16 620-659 180 127 0.02 0.04 AB * If register selected based on distance from register to oppo site wall is unsatisfactory on account of size or pressure loss, it is permissible to shift one or more spaces left or right in the tables to obtain a more suitable register. If requirements fall in Mnlr space, select two registers in place of one and divide CFM capac ity between the two registers. b Total pressure (static plu9 velocity) loss is based on FLAT FACE ADJUSTABLE BAR TYPE and does NOT include stackhead. , c Values on the right of line A and A'should not be used in ap plications such as churohes, auditoriums, and concert halls. # d Values on right of line B and B' should not be used in ap plications such as residential work, motion picture theaters, court rooms and schools. e For floor and baseboard registers where a velocity of ap-' prozimately 300 FPM is used, the free area 144 or sp- . A . CFM. . proximately, ----- Assume a pressure loss of .01. 1 For any volume under 190 CFM use Table 7. 1180-1219 1220-1259 1260-1299 1300-1339 1340-1379 1380-1419 1420-1459 1460-1500 446 297 214 151 107 0.02 0.03 0.04 0.08 0.15 476 317 228 161 116 0.02 0.03 0.04 0.07 0.14 507 338 243 172 122 0.01 0.02 0.04 0.07 0.13 539 359 258 183 130 0.01 0.02 0.04 0.07 0.12 382 274 195 138 0.02 0.04 0.07 0.12 403 290 206 146 0.02 0.03 0.06 0.12 308 218 156 0.03 0.06 0.10 324 230 163 0.03 0.06 0.10 A' B' Forced Warm Air Systems 475 Table 9. Suggested Bonnet Pressure Inches of water Total CFM Through Ant One Duct SUQQEBTED Bonnet Pressure In. Water Total CFM Trhough Ant One Duct Suggested Bonnet Pressure In. Water 800-1000 1000-1200 1200-1800 1800-2400 2400 to 3500 0.10 0.10 0.10 0.13 0.14 3500 to 5000 5000 to 7500 7500 to 10,000 10,000 to 12,000 12,000 to 14,000 . 0.15 0.25 0.375 0.500 0.750 WARM AIR CEILING PANEL SYSTEMS Warm air ceiling panel heating systems utilize a false ceiling suspended 3}i in. from the ceiling joists which have previously been covered on the bottom with sheets of plasterboard. Special hangers are used to suspend the false ceiling or heating panel from the joists. Steel supporting rods are installed through these hangers and metal lath is attached to the rods. The lath is then plastered to a thickness of % in., making a completely sealed air space above the ceiling. Warm air is delivered to this sealed space through a standard warm air duct, installed in the usual manner. The air is then circulated over the entire ceiling being guided by sheet-metal baffles. After the air has passed over the ceiling, it is returned to the fur nace through a return air duct for reheating. The system is closed, and no air is introduced into the heated space from the panel. (See also Chapter 24, Panel Heating.) Because a warm air ceiling panel system involves a different type of ceding construction, its installation is practically limited to new construc tion. Only automatically-fired and thermostatically-controlled furnaceblower units may be used with this system. The standard automatic heating controls consisting of a room thermostat, temperature limit con trol, blower control (fan switch), and primary control are all that are re quired. While warm air ceiling panel heating has particular advantages, in one-story utility room houses, it can be just as effectively installed in one- and two-story houses with basements. Complete design and installation procedure is given8 in Manual 7-A of the National Warm Air Heating and Air Conditioning Association. WARM AIR PERIMETER SYSTEMS Perimeter heating is a method of heating residential and commercial buildings, with or without basements, in which warm air is (a) conveyed under the floor to warm the floor surface and (b) introduced into the rooms, preferably under the windows, at or near the floor, and delivered upward in diffused pattern blanketing the outside walls. The return air is collected through one or more grilles located high on the interior sidewalls or in the ceiling. Suggested procedures9 for the design and installation of warm air perimeter heating systems are given in Manuals 4 and 10 and in the ac companying work sheets10 of the National Warm Air Heating and Air Con ditioning Association. The furnace may be either the down-flow or the conventional up-flow type. For basement-less houses the down-flow type is preferred since it requires a minimum amount of floor area and ductwork, and eliminates