Page 628 - 2018_IRC

FUEL GAS

NAT Max 849 648 638 627 967 743 730 715 1,057 848 825 788 1,237 983 963 928 894 1,346 1,098 1,074 1,037 1,005 973

Max 1,639 979 971 962 1,852 1,120 1,104 1,089 2,031 1,242 1,224 1,194 2,374 1,491 1,469 1,433 1,399 2,631 1,689 1,665 1,626 1,587 1,550
F Min 537 498 584 638 521 486 598 665 507 475 584 688 488 457 562 664 750 473 443 547 646 730 808
Single-wall metal connector NAT Max Max 569 1,118 453 673 443 664 433 656 658 1,257 513 768 500 754 486 740 718 1,373 559 849 544 834 520 808 838 1,591 673 1,015 657 997 628 966 601 937 927 1,751 754 1,146 734 1,126 702 1,092 677 1,060 651 1,028

2
1
Single Category I 0 1 F NAT Min Max 371 469 347 368 409 360 449 352 360 536 339 417 418 404 470 392 351 584 332 456 409 443 492 423 336 681 319 543 392 526 470 501 540 484 326 750 309 611 381 596 457 570 526 549 592 526

Number of Appliances Appliance Type Appliance Vent Connection 9 F NAT Max Min Max 894 267 369 541 251 284 533 295 277 526 327 271 1,002 258 414 617 246 321 604 305 311 591 344 300 1,093 253 449 681 242 354 667 299 344 643 363 325 1,259 244 523 812 232 413 795 287 400 768 349 381 742 404 367 1,379 238 573 914 227 468 896 279 457 866 339

VENT DIAMETER—(D ) inches 8 APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H F NAT F Max Min Max Max 695 211 284 522 423 201 213 320 416 237 208 313 409 263 203 307 777 206 319 580 482 197 246 363 470 245 235 352 458 280 225 342 844 202 344 628 531 193 272 400 518 241 261 388 497 296 241 369 966 195 388 713 631 187 314 473 616 231 298

NAT Min Max 165 204 159 156 187 152 207 148 161 234 155 179 193 171 223 163 158 254 153 194 190 186 237 171 153 283 148 224 182 217 228 203 272 192 149 306 144 248 178 239 222 224 264 210 309 196 (continued)

Max 373 231 225 220 412 261 252 243 444 287 277 261 499 337 326 308 290 537 375 363 344 325 306
7
F
Min Max 126 140 123 104 146 102 163 99 123 154 121 119 151 114 175 107 120 165 119 128 148 122 188 112 116 186 115 149 144 140 182 131 220 124 114 201 113 165 141 158 177 146 216 136 254 126
NAT
TABLE G2428.2(2) [504.2(2)] TYPE B DOUBLE-WALL GAS VENT 5 F NAT F Max Min Max Max 249 85 85 151 156 85 66 96 152 102 63 92 147 114 60 89 273 83 93 164 176 83 75 108 168 107 69 102 161 122 64 95 293 82 99 174 193 82 80 117 185 105 76 111 171 132 68 100 325 80 111 190 225 80 93 136 216 102 86 128 201 128 79 116 186 158 72 NA
6

NAT

Max Min Max 59 45 77 60 36 51 74 33 NA 83 31 NA 58 50 83 59 39 56 77 37 NA 90 33 NA 57 53 87 59 41 61 76 39 56 97 34 NA 56 57 93 57 47 69 75 44 63 95 39 NA NA NA NA 54 60 96 56 50 74 73 47 68 93 41 NA NA NA NA NA NA NA
4
F
Min 38 39 NA NA 37 39 NA NA 37 39 52 NA 36 38 51 NA NA 35 37 50 NA NA NA
LATERAL (L) (feet) 0 2 4 6 0 2 5 8 0 2 5 10 0 2 5 10 15 0 2 5 10 15 20

3
HEIGHT (H) (feet) 6 8 10 15 20

2018 INTERNATIONAL RESIDENTIAL CODE ® 603
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