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// CODE SNIPPET

G2428.2 (504.2) Application of Single Appliance Vent Tables G2428.2(1) and G2428.2(2)

2018 North Carolina Residential Code > 24 Fuel Gas > G2428 (504) Sizing of Category I Appliance Venting Systems > G2428.2 (504.2) Application of Single Appliance Vent Tables G2428.2(1) and G2428.2(2)
JUMP TO FULL CODE CHAPTER
The application of Tables G2428.2(1) and G2428.2(2) shall be subject to the requirements of Sections G2428.2.1 through G2428.2.17.

TABLE G2428.2(1) [504.2(1)]
TYPE B DOUBLE-WALL GAS VENT
Number of Appliances Single
Appliance Type Category I
Appliance Vent Connection Connected directly to vent

HEIGHT
(H)
(feet)
LATERAL
(L)
(feet)
VENT DIAMETER—(D) inches
3 4 5 6 7 8 9
APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H
FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT
Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max
6 0 0 78 46 0 152 86 0 251 141 0 375 205 0 524 285 0 698 370 0 897 470
2 13 51 36 18 97 67 27 157 105 32 232 157 44 321 217 53 425 285 63 543 370
4 21 49 34 30 94 64 39 153 103 50 227 153 66 316 211 79 419 279 93 536 362
6 25 46 32 36 91 61 47 149 100 59 223 149 78 310 205 93 413 273 110 530 354
8 0 0 84 50 0 165 94 0 276 155 0 415 235 0 583 320 0 780 415 0 1,006 537
2 12 57 40 16 109 75 25 178 120 28 263 180 42 365 247 50 483 322 60 619 418
5 23 53 38 32 103 71 42 171 115 53 255 173 70 356 237 83 473 313 99 607 407
8 28 49 35 39 98 66 51 164 109 64 247 165 84 347 227 99 463 303 117 596 396
10 0 0 88 53 0 175 100 0 295 166 0 447 255 0 631 345 0 847 450 0 1,096 585
2 12 61 42 17 118 81 23 194 129 26 289 195 40 402 273 48 533 355 57 684 457
5 23 57 40 32 113 77 41 187 124 52 280 188 68 392 263 81 522 346 95 671 446
10 30 51 36 41 104 70 54 176 115 67 267 175 88 376 245 104 504 330 122 651 427
15 0 0 94 58 0 191 112 0 327 187 0 502 285 0 716 390 0 970 525 0 1,263 682
2 11 69 48 15 136 93 20 226 150 22 339 225 38 475 316 45 633 414 53 815 544
5 22 65 45 30 130 87 39 219 142 49 330 217 64 463 300 76 620 403 90 800 529
10 29 59 41 40 121 82 51 206 135 64 315 208 84 445 288 99 600 386 116 777 507
15 35 53 37 48 112 76 61 195 128 76 301 198 98 429 275 115 580 373 134 755 491
20 0 0 97 61 0 202 119 0 349 202 0 540 307 0 776 430 0 1,057 575 0 1,384 752
2 10 75 51 14 149 100 18 250 166 20 377 249 33 531 346 41 711 470 50 917 612
5 21 71 48 29 143 96 38 242 160 47 367 241 62 519 337 73 697 460 86 902 599
10 28 64 44 38 133 89 50 229 150 62 351 228 81 499 321 95 675 443 112 877 576
15 34 58 40 46 124 84 59 217 142 73 337 217 94 481 308 111 654 427 129 853 557
20 48 52 35 55 116 78 69 206 134 84 322 206 107 464 295 125 634 410 145 830 537
30 0 0 100 64 0 213 128 0 374 220 0 587 336 0 853 475 0 1,173 650 0 1,548 855
2 9 81 56 13 166 112 14 283 185 18 432 280 27 613 394 33 826 535 42 1,072 700
5 21 77 54 28 160 108 36 275 176 45 421 273 58 600 385 69 811 524 82 1,055 688
10 27 70 50 37 150 102 48 262 171 59 405 261 77 580 371 91 788 507 107 1,028 668
15 33 64 NA 44 141 96 57 249 163 70 389 249 90 560 357 105 765 490 124 1,002 648
20 56 58 NA 53 132 90 66 237 154 80 374 237 102 542 343 119 743 473 139 977 628
30 NA NA NA 73 113 NA 88 214 NA 104 346 219 131 507 321 149 702 444 171 929 594
50 0 0 101 67 0 216 134 0 397 232 0 633 363 0 932 518 0 1,297 708 0 1,730 952
2 8 86 61 11 183 122 14 320 206 15 497 314 22 715 445 26 975 615 33 1,276 813
5 20 82 NA 27 177 119 35 312 200 43 487 308 55 702 438 65 960 605 77 1,259 798
10 26 76 NA 35 168 114 45 299 190 56 471 298 73 681 426 86 935 589 101 1,230 773
15 59 70 NA 42 158 NA 54 287 180 66 455 288 85 662 413 100 911 572 117 1,203 747
20 NA NA NA 50 149 NA 63 275 169 76 440 278 97 642 401 113 888 556 131 1,176 722
30 NA NA NA 69 131 NA 84 250 NA 99 410 259 123 605 376 141 844 522 161 1,125 670

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W.


TABLE G2428.2(2) [504.2(2)]
TYPE B DOUBLE-WALL GAS VENT
Number of Appliances Single
Appliance Type Category I
Appliance Vent Connection Single-wall metal connector

HEIGHT
(H)
(feet)
LATERAL
(L)
(feet)
VENT DIAMETER—(D) inches
3 4 5 6 7 8 9 10 12
APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H
FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT FAN NAT
Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max Min Max Max
6 0 38 77 45 59 151 85 85 249 140 126 373 204 165 522 284 211 695 369 267 894 469 371 1,118 569 537 1,639 849
2 39 51 36 60 96 66 85 156 104 123 231 156 159 320 213 201 423 284 251 541 368 347 673 453 498 979 648
4 NA NA 33 74 92 63 102 152 102 146 225 152 187 313 208 237 416 277 295 533 360 409 664 443 584 971 638
6 NA NA 31 83 89 60 114 147 99 163 220 148 207 307 203 263 409 271 327 526 352 449 656 433 638 962 627
8 0 37 83 50 58 164 93 83 273 154 123 412 234 161 580 319 206 777 414 258 1,002 536 360 1,257 658 521 1,852 967
2 39 56 39 59 108 75 83 176 119 121 261 179 155 363 246 197 482 321 246 617 417 339 768 513 486 1,120 743
5 NA NA 37 77 102 69 107 168 114 151 252 171 193 352 235 245 470 311 305 604 404 418 754 500 598 1,104 730
8 NA NA 33 90 95 64 122 161 107 175 243 163 223 342 225 280 458 300 344 591 392 470 740 486 665 1,089 715
10 0 37 87 53 57 174 99 82 293 165 120 444 254 158 628 344 202 844 449 253 1,093 584 351 1,373 718 507 2,031 1,057
2 39 61 41 59 117 80 82 193 128 119 287 194 153 400 272 193 531 354 242 681 456 332 849 559 475 1,242 848
5 52 56 39 76 111 76 105 185 122 148 277 186 190 388 261 241 518 344 299 667 443 409 834 544 584 1,224 825
10 NA NA 34 97 100 68 132 171 112 188 261 171 237 369 241 296 497 325 363 643 423 492 808 520 688 1,194 788
15 0 36 93 57 56 190 111 80 325 186 116 499 283 153 713 388 195 966 523 244 1,259 681 336 1,591 838 488 2,374 1,237
2 38 69 47 57 136 93 80 225 149 115 337 224 148 473 314 187 631 413 232 812 543 319 1,015 673 457 1,491 983
5 51 63 44 75 128 86 102 216 140 144 326 217 182 459 298 231 616 400 287 795 526 392 997 657 562 1,469 963
10 NA NA 39 95 116 79 128 201 131 182 308 203 228 438 284 284 592 381 349 768 501 470 966 628 664 1,433 928
15 NA NA NA NA NA 72 158 186 124 220 290 192 272 418 269 334 568 367 404 742 484 540 937 601 750 1,399 894
20 0 35 96 60 54 200 118 78 346 201 114 537 306 149 772 428 190 1,053 573 238 1,379 750 326 1,751 927 473 2,631 1,346
2 37 74 50 56 148 99 78 248 165 113 375 248 144 528 344 182 708 468 227 914 611 309 1,146 754 443 1,689 1,098
5 50 68 47 73 140 94 100 239 158 141 363 239 178 514 334 224 692 457 279 896 596 381 1,126 734 547 1,665 1,074
10 NA NA 41 93 129 86 125 223 146 177 344 224 222 491 316 277 666 437 339 866 570 457 1,092 702 646 1,626 1,037
15 NA NA NA NA NA 80 155 208 136 216 325 210 264 469 301 325 640 419 393 838 549 526 1,060 677 730 1,587 1,005
20 NA NA NA NA NA NA 186 192 126 254 306 196 309 448 285 374 616 400 448 810 526 592 1,028 651 808 1,550 973
30 0 34 99 63 53 211 127 76 372 219 110 584 334 144 849 472 184 1,168 647 229 1,542 852 312 1,971 1,056 454 2,996 1,545
2 37 80 56 55 164 111 76 281 183 109 429 279 139 610 392 175 823 533 219 1,069 698 296 1,346 863 424 1,999 1,308
5 49 74 52 72 157 106 98 271 173 136 417 271 171 595 382 215 806 521 269 1,049 684 366 1,324 846 524 1,971 1,283
10 NA NA NA 91 144 98 122 255 168 171 397 257 213 570 367 265 777 501 327 1,017 662 440 1,287 821 620 1,927 1,234
15 NA NA NA 115 131 NA 151 239 157 208 377 242 255 547 349 312 750 481 379 985 638 507 1,251 794 702 1,884 1,205
20 NA NA NA NA NA NA 181 223 NA 246 357 228 298 524 333 360 723 461 433 955 615 570 1,216 768 780 1,841 1,166
30 NA NA NA NA NA NA NA NA NA NA NA NA 389 477 305 461 670 426 541 895 574 704 1,147 720 937 1,759 1,101
50 0 33 99 66 51 213 133 73 394 230 105 629 361 138 928 515 176 1,292 704 220 1,724 948 295 2,223 1,189 428 3,432 1,818
2 36 84 61 53 181 121 73 318 205 104 495 312 133 712 443 168 971 613 209 1,273 811 280 1,615 1,007 401 2,426 1,509
5 48 80 NA 70 174 117 94 308 198 131 482 305 164 696 435 204 953 602 257 1,252 795 347 1,591 991 496 2,396 1,490
10 NA NA NA 89 160 NA 118 292 186 162 461 292 203 671 420 253 923 583 313 1,217 765 418 1,551 963 589 2,347 1,455
15 NA NA NA 112 148 NA 145 275 174 199 441 280 244 646 405 299 894 562 363 1,183 736 481 1,512 934 668 2,299 1,421
20 NA NA NA NA NA NA 176 257 NA 236 420 267 285 622 389 345 866 543 415 1,150 708 544 1,473 906 741 2,251 1,387
30 NA NA NA NA NA NA NA NA NA 315 376 NA 373 573 NA 442 809 502 521 1,086 649 674 1,399 848 892 2,159 1,318

For SI:1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W.
SEE MORE

Related Code Sections


G2428.2 Fuel Gas, (504.2) Application of Single Appliance Vent Tables G2428.2(1) and G2428.2(2)
thermal unit per hour = 0.2931 W. TABLE G2428.2(2) [504.2(2)] TYPE B DOUBLE-WALL GAS VENT Number of Appliances Single Appliance ...
2018 North Carolina Residential Code > 24 Fuel Gas > G2428 (504) Sizing of Category I Appliance Venting Systems > G2428.2 (504.2) Application of Single Appliance Vent Tables G2428.2(1) and G2428.2(2)
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