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// CODE SNIPPET

510.2 Multiple Appliance Vent Table 510.2(1) Through Table 510.2(9)

Uniform Plumbing Code 2018 of Nevada > 5 Water Heaters > 510.0 Sizing of Category I Venting Systems > 510.2 Multiple Appliance Vent Table 510.2(1) Through Table 510.2(9)
JUMP TO FULL CODE CHAPTER
Venting Table 510.2(1) through Table 510.2(9) shall not be used where obstructions are installed in the venting system. The installation of vents serving listed appliances with vent dampers shall be in accordance with the appliance manufacturer's instructions or in accordance with the following:
  1. The maximum capacity of the vent connector shall be determined using the NAT Max column.
  2. The maximum capacity of the vertical vent or chimney shall be determined using the FAN + NAT column when the second appliance is a fan-assisted appliance, or the NAT + NAT column when the second appliance is equipped with a draft hood.
  3. The minimum capacity shall be determined as if the appliance were a fan-assisted appliance, as follows:
    1. The minimum capacity of the vent connector shall be determined using the FAN Min column.
    2. The FAN + FAN column shall be used when the second appliance is a fan-assisted appliance, and the FAN + NAT column shall be used when the second appliance is equipped with a draft hood, to determine whether the vertical vent or chimney configuration is not permitted (NA). Where the vent configuration is NA, the vent configuration shall not be permitted and an alternative venting configuration shall be utilized. [NFPA 54:13.2.1]
TABLE 510.2(1)
TYPE B DOUBLE-WALL VENT [NFPA 54: TABLE 13.2(a)]*
  NUMBER OF APPLIANCES: TWO OR MORE
APPLIANCE TYPE: CATEGORY I
APPLIANCE VENT CONNECTION: TYPE B DOUBLE-WALL CONNECTOR
  VENT CONNECTOR CAPACITY
TYPE B DOUBLE-WALL VENT AND CONNECTOR DIAMETER — D (inch)
3 4 5 6 7
APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
CONNECTOR RISE
R
(feet)
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
6 1 22 37 26 35 66 46 46 106 72 58 164 104 77 225 142
  2 23 41 31 37 75 55 48 121 86 60 183 124 79 253 168
  3 24 44 35 38 81 62 49 132 96 62 199 139 82 275 189
8 1 22 40 27 35 72 48 49 114 76 64 176 109 84 243 148
  2 23 44 32 36 80 57 51 128 90 66 195 129 86 269 175
  3 24 47 36 37 87 64 53 139 101 67 210 145 88 290 198
10 1 22 43 28 34 78 50 49 123 78 65 189 113 89 257 154
  2 23 47 33 36 86 59 51 136 93 67 206 134 91 282 182
  3 24 50 37 37 92 67 52 146 104 69 220 150 94 303 205
15 1 21 50 30 33 89 53 47 142 83 64 220 120 88 298 163
  2 22 53 35 35 96 63 49 153 99 66 235 142 91 320 193
  3 24 55 40 36 102 71 51 163 111 68 248 160 93 339 218
20 1 21 54 31 33 99 56 46 157 87 62 246 125 86 334 171
  2 22 57 37 34 105 66 48 167 104 64 259 149 89 354 202
  3 23 60 42 35 110 74 50 176 116 66 271 168 91 371 228
30 1 20 62 33 31 113 59 45 181 93 60 288 134 83 391 182
  2 21 64 39 33 118 70 47 190 110 62 299 158 85 408 215
  3 22 66 44 34 123 79 48 198 124 64 309 178 88 423 242
50 1 19 71 36 30 133 64 43 216 101 57 349 145 78 477 197
  2 21 73 43 32 137 76 45 223 119 59 358 172 81 490 234
  3 22 75 48 33 141 86 46 229 134 61 366 194 83 502 263
100 1 18 82 37 28 158 66 40 262 104 53 442 150 73 611 204
  2 19 83 44 30 161 79 42 267 123 55 447 178 75 619 242
  3 20 84 50 31 163 89 44 272 138 57 452 200 78 627 272
  COMMON VENT CAPACITY
TYPE B DOUBLE-WALL COMMON VENT DIAMETER — D (inch)
4 5 6 7
COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
6 92 81 65 140 116 103 204 161 147 309 248 200
8 101 90 73 155 129 114 224 178 163 339 275 223
10 110 97 79 169 141 124 243 194 178 367 299 242
15 125 112 91 195 164 144 283 228 206 427 352 280
20 136 123 102 215 183 160 314 255 229 475 394 310
30 152 138 118 244 210 185 361 297 266 547 459 360
50 167 153 134 279 244 214 421 353 310 641 547 423
100 175 163 NA 311 277 NA 489 421 NA 751 658 479
For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 square inch = 0.000645 m2
* NA: Not applicable.
TABLE 510.2(1)
TYPE B DOUBLE-WALL VENT [NFPA 54: TABLE 13.2(a)] (continued)
  NUMBER OF APPLIANCES: TWO OR MORE
APPLIANCE TYPE: CATEGORY I
APPLIANCE VENT CONNECTION: TYPE B DOUBLE-WALL CONNECTOR
VENT CONNECTOR CAPACITY
TYPE B DOUBLE-WALL VENT AND CONNECTOR DIAMETER — D (inch)
8 9 10
APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
CONNECTOR RISE
R
(feet)
FAN NAT FAN NAT FAN NAT
Min Max Max Min Max Max Min Max Max
6 1 92 296 185 109 376 237 128 466 289
  2 95 333 220 112 424 282 131 526 345
  3 97 363 248 114 463 317 134 575 386
8 1 100 320 194 118 408 248 138 507 303
  2 103 356 230 121 454 294 141 564 358
  3 105 384 258 123 492 330 143 612 402
10 1 106 341 200 125 436 257 146 542 314
  2 109 374 238 128 479 305 149 596 372
  3 111 402 268 131 515 342 152 642 417
15 1 110 389 214 134 493 273 162 609 333
  2 112 419 253 137 532 323 165 658 394
  3 115 445 286 140 565 365 167 700 444
20 1 107 436 224 131 552 285 158 681 347
  2 110 463 265 134 587 339 161 725 414
  3 113 486 300 137 618 383 164 764 466
30 1 103 512 238 125 649 305 151 802 372
  2 105 535 282 129 679 360 155 840 439
  3 108 555 317 132 706 405 158 874 494
50 1 97 627 257 120 797 330 144 984 403
  2 100 645 306 123 820 392 148 1014 478
  3 103 661 343 126 842 441 151 1043 538
100 1 91 810 266 112 1038 341 135 1285 417
  2 94 822 316 115 1054 405 139 1306 494
  3 97 834 355 118 1069 455 142 1327 555
  COMMON VENT CAPACITY
TYPE B DOUBLE-WALL COMMON VENT DIAMETER - D (inch)
8 9 10
COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
6 404 314 260 547 434 335 672 520 410
8 444 348 290 602 480 378 740 577 465
10 477 377 315 649 522 405 800 627 495
15 556 444 365 753 612 465 924 733 565
20 621 499 405 842 688 523 1035 826 640
30 720 585 470 979 808 605 1209 975 740
50 854 706 550 1164 977 705 1451 1188 860
100 1025 873 625 1408 1215 800 1784 1502 975
For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 square inch = 0.000645 m2
TABLE 510.2(1)
TYPE B DOUBLE-WALL VENT [NFPA 54: TABLE 13.2(a)] (continued)*
  NUMBER OF APPLIANCES: TWO OR MORE
APPLIANCE TYPE: CATEGORY I
APPLIANCE VENT CONNECTION: TYPE B DOUBLE-WALL CONNECTOR
  VENT CONNECTOR CAPACITY
TYPE B DOUBLE-WALL VENT AND CONNECTOR DIAMETER — D (inch)
12 14 16 18
APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
CONNECTOR RISE
R
(feet)
FAN NAT FAN NAT FAN NAT FAN NAT
Min Max Max Min Max Max Min Max Max Min Max Max
6 2 174 764 496 223 1046 653 281 1371 853 346 1772 1080
  4 180 897 616 230 1231 827 287 1617 1081 352 2069 1370
  6 NA NA NA NA NA NA NA NA NA NA NA NA
8 2 186 822 516 238 1126 696 298 1478 910 365 1920 1150
  4 192 952 644 244 1307 884 305 1719 1150 372 2211 1460
  6 198 1050 772 252 1445 1072 313 1902 1390 380 2434 1770
10 2 196 870 536 249 1195 730 311 1570 955 379 2049 1205
  4 201 997 664 256 1371 924 318 1804 1205 387 2332 1535
  6 207 1095 792 263 1509 1118 325 1989 1455 395 2556 1865
15 2 214 967 568 272 1334 790 336 1760 1030 408 2317 1305
  4 221 1085 712 279 1499 1006 344 1978 1320 416 2579 1665
  6 228 1181 856 286 1632 1222 351 2157 1610 424 2796 2025
20 2 223 1051 596 291 1443 840 357 1911 1095 430 2533 1385
  4 230 1162 748 298 1597 1064 365 2116 1395 438 2778 1765
  6 237 1253 900 307 1726 1288 373 2287 1695 450 2984 2145
30 2 216 1217 632 286 1664 910 367 2183 1190 461 2891 1540
  4 223 1316 792 294 1802 1160 376 2366 1510 474 3110 1920
  6 231 1400 952 303 1920 1410 384 2524 1830 485 3299 2340
50 2 206 1479 689 273 2023 1007 350 2659 1315 435 3548 1665
  4 213 1561 860 281 2139 1291 359 2814 1685 447 3730 2135
  6 221 1631 1031 290 2242 1575 369 2951 2055 461 3893 2605
100 2 192 1923 712 254 2644 1050 326 3490 1370 402 4707 1740
  4 200 1984 888 263 2731 1346 336 3606 1760 414 4842 2220
  6 208 2035 1064 272 2811 1642 346 3714 2150 426 4968 2700
  COMMON VENT CAPACITY
TYPE B DOUBLE-WALL COMMON VENT DIAMETER — D (inch)
12 14 16 18
COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
6 900 696 588 1284 990 815 1735 1336 1065 2253 1732 1345
8 994 773 652 1423 1103 912 1927 1491 1190 2507 1936 1510
10 1076 841 712 1542 1200 995 2093 1625 1300 2727 2113 1645
15 1247 986 825 1794 1410 1158 2440 1910 1510 3184 2484 1910
20 1405 1116 916 2006 1588 1290 2722 2147 1690 3561 2798 2140
30 1658 1327 1025 2373 1892 1525 3220 2558 1990 4197 3326 2520
50 2024 1640 1280 2911 2347 1863 3964 3183 2430 5184 4149 3075
100 2569 2131 1670 3732 3076 2450 5125 4202 3200 6749 5509 4050
For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 square inch = 0.000645 m2
* NA: Not applicable.
TABLE 510.2(1)
TYPE B DOUBLE-WALL VENT [NFPA 54: TABLE 13.2(a)] (continued)*
  NUMBER OF APPLIANCES: TWO OR MORE
APPLIANCE TYPE: CATEGORY I
APPLIANCE VENT CONNECTION: TYPE B DOUBLE-WALL CONNECTOR
  VENT CONNECTOR CAPACITY
TYPE B DOUBLE-WALL VENT AND CONNECTOR DIAMETER — D (inch)
20 22 24
APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
CONNECTOR RISE
R
(feet)
FAN NAT FAN NAT FAN NAT
Min Max Max Min Max Max Min Max Max
6 2 NA NA NA NA NA NA NA NA NA
  4 NA NA NA NA NA NA NA NA NA
  6 NA NA NA NA NA NA NA NA NA
8 2 NA NA NA NA NA NA NA NA NA
  4 471 2737 1800 560 3319 2180 662 3957 2590
  6 478 3018 2180 568 3665 2640 669 4373 3130
10 2 NA NA NA NA NA NA NA NA NA
  4 486 2887 1890 581 3502 2280 686 4175 2710
  6 494 3169 2290 589 3849 2760 694 4593 3270
15 2 NA NA NA NA NA NA NA NA NA
  4 523 3197 2060 624 3881 2490 734 4631 2960
  6 533 3470 2510 634 4216 3030 743 5035 3600
20 2 NA NA NA NA NA NA NA NA NA
  4 554 3447 2180 661 4190 2630 772 5005 3130
  6 567 3708 2650 671 4511 3190 785 5392 3790
30 2 NA NA NA NA NA NA NA NA NA
  4 619 3840 2365 728 4861 2860 847 5606 3410
  6 632 4080 2875 741 4976 3480 860 5961 4150
50 2 NA NA NA NA NA NA NA NA NA
  4 580 4601 2633 709 5569 3185 851 6633 3790
  6 594 4808 3208 724 5826 3885 867 6943 4620
100 2 NA NA NA NA NA NA NA NA NA
  4 523 5982 2750 639 7254 3330 769 8650 3950
  6 539 6143 3350 654 7453 4070 786 8892 4810
  COMMON VENT CAPACITY
TYPE B DOUBLE-WALL COMMON VENT DIAMETER — D (inch)
20 22 24
COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
6 2838 2180 1660 3488 2677 1970 4206 3226 2390
8 3162 2439 1860 3890 2998 2200 4695 3616 2680
10 3444 2665 2030 4241 3278 2400 5123 3957 2920
15 4026 3133 2360 4971 3862 2790 6016 4670 3400
20 4548 3552 2640 5573 4352 3120 6749 5261 3800
30 5303 4193 3110 6539 5157 3680 7940 6247 4480
50 6567 5240 3800 8116 6458 4500 9837 7813 5475
100 8597 6986 5000 10 681 8648 5920 13 004 10 499 7200
For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 square inch = 0.000645 m2
* NA: Not applicable.
TABLE 510.2(2)
TYPE B DOUBLE-WALL VENT [NFPA 54: TABLE 13.2(b)]*
  NUMBER OF APPLIANCES: TWO OR MORE
APPLIANCE TYPE: CATEGORY I
APPLIANCE VENT CONNECTION: SINGLE-WALL METAL CONNECTOR
  VENT CONNECTOR CAPACITY
TYPE B DOUBLE-WALL VENT AND CONNECTOR DIAMETER — D (inch)
3 4 5 6 7
APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
CONNECTOR RISE
R
(feet)
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
6 1 NA NA 26 NA NA 46 NA NA 71 NA NA 102 207 223 140
  2 NA NA 31 NA NA 55 NA NA 85 168 182 123 215 251 167
  3 NA NA 34 NA NA 62 121 131 95 175 198 138 222 273 188
8 1 NA NA 27 NA NA 48 NA NA 75 NA NA 106 226 240 145
  2 NA NA 32 NA NA 57 125 126 89 184 193 127 234 266 173
  3 NA NA 35 NA NA 64 130 138 100 191 208 144 241 287 197
10 1 NA NA 28 NA NA 50 119 121 77 182 186 110 240 253 150
  2 NA NA 33 84 85 59 124 134 91 189 203 132 248 278 183
  3 NA NA 36 89 91 67 129 144 102 197 217 148 257 299 203
15 1 NA NA 29 79 87 52 116 138 81 177 214 116 238 291 158
  2 NA NA 34 83 94 62 121 150 97 185 230 138 246 314 189
  3 NA NA 39 87 100 70 127 160 109 193 243 157 255 333 215
20 1 49 56 30 78 97 54 115 152 84 175 238 120 233 325 165
  2 52 59 36 82 103 64 120 163 101 182 252 144 243 346 197
  3 55 62 40 87 107 72 125 172 113 190 264 164 252 363 223
30 1 47 60 31 77 110 57 112 175 89 169 278 129 226 380 175
  2 51 62 37 81 115 67 117 185 106 177 290 152 236 397 208
  3 54 64 42 85 119 76 122 193 120 185 300 172 244 412 235
50 1 46 69 34 75 128 60 109 207 96 162 336 137 217 460 188
  2 49 71 40 79 132 72 114 215 113 170 345 164 226 473 223
  3 52 72 45 83 136 82 119 221 123 178 353 186 235 486 252
100 1 45 79 34 71 150 61 104 249 98 153 424 140 205 585 192
  2 48 80 41 75 153 73 110 255 115 160 428 167 212 593 228
  3 51 81 46 79 157 85 114 260 129 168 433 190 222 603 256
  COMMON VENT CAPACITY
TYPE B DOUBLE-WALL COMMON VENT DIAMETER — D (inch)
4 5 6 7
COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
6 NA 78 64 NA 113 99 200 158 144 304 244 196
8 NA 87 71 NA 126 111 218 173 159 331 269 218
10 NA 94 76 163 137 120 237 189 174 357 292 236
15 121 108 88 189 159 140 275 221 200 416 343 274
20 131 118 98 208 177 156 305 247 223 463 383 302
30 145 132 113 236 202 180 350 286 257 533 446 349
50 159 145 128 268 233 208 406 337 296 622 529 410
100 166 153 NA 297 263 NA 469 398 NA 726 633 464
For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 square inch = 0.000645 m2
* NA: Not applicable.
TABLE 510.2(2)
TYPE B DOUBLE-WALL VENT [NFPA 54: TABLE 13.2(b)] (continued)
  NUMBER OF APPLIANCES: TWO OR MORE
APPLIANCE TYPE: CATEGORY I
APPLIANCE VENT CONNECTION: SINGLE-WALL METAL CONNECTOR
  VENT CONNECTOR CAPACITY
SINGLE-WALL METAL VENT CONNECTOR DIAMETER - D (inch)
8 9 10
APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
CONNECTOR RISE
R
(feet)
FAN NAT FAN NAT FAN NAT
Min Max Max Min Max Max Min Max Max
6 1 262 293 183 325 373 234 447 463 286
  2 271 331 219 334 422 281 458 524 344
  3 279 361 247 344 462 316 468 574 385
8 1 285 316 191 352 403 244 481 502 299
  2 293 353 228 360 450 292 492 560 355
  3 302 381 256 370 489 328 501 609 400
10 1 302 335 196 372 429 252 506 534 308
  2 311 369 235 381 473 302 517 589 368
  3 320 398 265 391 511 339 528 637 413
15 1 312 380 208 397 482 266 556 596 324
  2 321 411 248 407 522 317 568 646 387
  3 331 438 281 418 557 360 579 690 437
20 1 306 425 217 390 538 276 546 664 336
  2 317 453 259 400 574 331 558 709 403
  3 326 476 294 412 607 375 570 750 457
30 1 296 497 230 378 630 294 528 779 358
  2 307 521 274 389 662 349 541 819 425
  3 316 542 309 400 690 394 555 855 482
50 1 284 604 245 364 768 314 507 951 384
  2 294 623 293 376 793 375 520 983 458
  3 304 640 331 387 816 423 535 1013 518
100 1 269 774 249 345 993 321 476 1236 393
  2 279 788 299 358 1011 383 490 1259 469
  3 289 801 339 368 1027 431 506 1280 527
  COMMON VENT CAPACITY
TYPE B DOUBLE-WALL COMMON VENT DIAMETER — D (inch)
8 9 10
COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
6 398 310 257 541 429 332 665 515 407
8 436 342 285 592 473 373 730 569 460
10 467 369 309 638 512 398 787 617 487
15 544 434 357 738 599 456 905 718 553
20 606 487 395 824 673 512 1013 808 626
30 703 570 459 958 790 593 1183 952 723
50 833 686 535 1139 954 689 1418 1157 838
100 999 846 606 1378 1185 780 1741 1459 948
For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 square inch = 0.000645 m2
TABLE 510.2(3)
MASONRY CHIMNEY [NFPA 54: TABLE 13.2(c)]*
  NUMBER OF APPLIANCES: TWO OR MORE
APPLIANCE TYPE: CATEGORY I
APPLIANCE VENT CONNECTION: TYPE B DOUBLE-WALL CONNECTOR
  VENT CONNECTOR CAPACITY
TYPE B DOUBLE-WALL VENT AND CONNECTOR DIAMETER — D (inch)
3 4 5 6 7
APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
CONNECTOR RISE
R
(feet)
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
6 1 24 33 21 39 62 40 52 106 67 65 194 101 87 274 141
  2 26 43 28 41 79 52 53 133 85 67 230 124 89 324 173
  3 27 49 34 42 92 61 55 155 97 69 262 143 91 369 203
8 1 24 39 22 39 72 41 55 117 69 71 213 105 94 304 148
  2 26 47 29 40 87 53 57 140 86 73 246 127 97 350 179
  3 27 52 34 42 97 62 59 159 98 75 269 145 99 383 206
10 1 24 42 22 38 80 42 55 130 71 74 232 108 101 324 153
  2 26 50 29 40 93 54 57 153 87 76 261 129 103 366 184
  3 27 55 35 41 105 63 58 170 100 78 284 148 106 397 209
15 1 24 48 23 38 93 44 54 154 74 72 277 114 100 384 164
  2 25 55 31 39 105 55 56 174 89 74 299 134 103 419 192
  3 26 59 35 41 115 64 57 189 102 76 319 153 105 448 215
20 1 24 52 24 37 102 46 53 172 77 71 313 119 98 437 173
  2 25 58 31 39 114 56 55 190 91 73 335 138 101 467 199
  3 26 63 35 40 123 65 57 204 104 75 353 157 104 493 222
30 1 24 54 25 37 111 48 52 192 82 69 357 127 96 504 187
  2 25 60 32 38 122 58 54 208 95 72 376 145 99 531 209
  3 26 64 36 40 131 66 56 221 107 74 392 163 101 554 233
50 1 23 51 25 36 116 51 51 209 89 67 405 143 92 582 213
  2 24 59 32 37 127 61 53 225 102 70 421 161 95 604 235
  3 26 64 36 39 135 69 55 237 115 72 435 180 98 624 260
100 1 23 46 24 35 108 50 49 208 92 65 428 155 88 640 237
  2 24 53 31 37 120 60 51 224 105 67 444 174 92 660 260
  3 25 59 35 38 130 68 53 237 118 69 458 193 94 679 285
  COMMON VENT CAPACITY
MINIMUM INTERNAL AREA OF MASONRY CHIMNEY FLUE (square inches)
12 19 28 38 50
COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
6 NA 74 25 NA 119 46 NA 178 71 NA 257 103 NA 351 143
8 NA 80 28 NA 130 53 NA 193 82 NA 279 119 NA 384 163
10 NA 84 31 NA 138 56 NA 207 90 NA 299 131 NA 409 177
15 NA NA 36 NA 152 67 NA 233 106 NA 334 152 523 467 212
20 NA NA 41 NA NA 75 NA 250 122 NA 368 172 565 508 243
30 NA NA NA NA NA NA NA 270 137 NA 404 198 615 564 278
50 NA NA NA NA NA NA NA NA NA NA NA NA NA 620 328
100 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 348
For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 square inch = 0.000645 m2
* NA: Not applicable.
TABLE 510.2(3)
MASONRY CHIMNEY [NFPA 54: TABLE 13.2(c)] (continued)*
  NUMBER OF APPLIANCES: TWO OR MORE
APPLIANCE TYPE: CATEGORY I
APPLIANCE VENT CONNECTION: TYPE B DOUBLE-WALL CONNECTOR
  VENT CONNECTOR CAPACITY
TYPE B DOUBLE-WALL VENT AND CONNECTOR DIAMETER — D (inch)
8 9 10
APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
CONNECTOR RISE
R
(feet)
FAN NAT FAN NAT FAN NAT
Min Max Max Min Max Max Min Max Max
6 1 104 370 201 124 479 253 145 599 319
  2 107 436 232 127 562 300 148 694 378
  3 109 491 270 129 633 349 151 795 439
8 1 113 414 210 134 539 267 156 682 335
  2 116 473 240 137 615 311 160 776 394
  3 119 517 276 139 672 358 163 848 452
10 1 120 444 216 142 582 277 165 739 348
  2 123 498 247 145 652 321 168 825 407
  3 126 540 281 147 705 366 171 893 463
15 1 125 511 229 153 658 297 184 824 375
  2 128 558 260 156 718 339 187 900 432
  3 131 597 292 159 760 382 190 960 486
20 1 123 584 239 150 752 312 180 943 397
  2 126 625 270 153 805 354 184 1011 452
  3 129 661 301 156 851 396 187 1067 505
30 1 119 680 255 145 883 337 175 1115 432
  2 122 715 287 149 928 378 179 1171 484
  3 125 746 317 152 968 418 182 1220 535
50 1 115 798 294 140 1049 392 168 1334 506
  2 118 827 326 143 1085 433 172 1379 558
  3 121 854 357 147 1118 474 176 1421 611
100 1 109 907 334 134 1222 454 161 1589 596
  2 113 933 368 138 1253 497 165 1626 651
  3 116 956 399 141 1282 540 169 1661 705
  COMMON VENT CAPACITY
MINIMUM INTERNAL AREA OF MASONRY CHIMNEY FLUE (square inches)
63 78 113
COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
6 NA 458 188 NA 582 246 1041 853 NA
8 NA 501 218 724 636 278 1144 937 408
10 606 538 236 776 686 302 1226 1010 454
15 682 611 283 874 781 365 1374 1156 546
20 742 668 325 955 858 419 1513 1286 648
30 816 747 381 1062 969 496 1702 1473 749
50 879 831 461 1165 1089 606 1905 1692 922
100 NA NA 499 NA NA 669 2053 1921 1058
For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 square inch = 0.000645 m2
* NA: Not applicable.
TABLE 510.2(4)
MASONRY CHIMNEY [NFPA 54: TABLE 13.2(d)]*
  NUMBER OF APPLIANCES: TWO OR MORE
APPLIANCE TYPE: CATEGORY I
APPLIANCE VENT CONNECTION: SINGLE-WALL METAL CONNECTOR
  VENT CONNECTOR CAPACITY
SINGLE-WALL METAL VENT CONNECTOR DIAMETER — D (inch)
3 4 5 6 7
APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
CONNECTOR RISE
R
(feet)
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
6 1 NA NA 21 NA NA 39 NA NA 66 179 191 100 231 271 140
  2 NA NA 28 NA NA 52 NA NA 84 186 227 123 239 321 172
  3 NA NA 34 NA NA 61 134 153 97 193 258 142 247 365 202
8 1 NA NA 21 NA NA 40 NA NA 68 195 208 103 250 298 146
  2 NA NA 28 NA NA 52 137 139 85 202 240 125 258 343 177
  3 NA NA 34 NA NA 62 143 156 98 210 264 145 266 376 205
10 1 NA NA 22 NA NA 41 130 151 70 202 225 106 267 316 151
  2 NA NA 29 NA NA 53 136 150 86 210 255 128 276 358 181
  3 NA NA 34 97 102 62 143 166 99 217 277 147 284 389 207
15 1 NA NA 23 NA NA 43 129 151 73 199 271 112 268 376 161
  2 NA NA 30 92 103 54 135 170 88 207 295 132 277 411 189
  3 NA NA 34 96 112 63 141 185 101 215 315 151 286 439 213
20 1 NA NA 23 87 99 45 128 167 76 197 303 117 265 425 169
  2 NA NA 30 91 111 55 134 185 90 205 325 136 274 455 195
  3 NA NA 35 96 119 64 140 199 103 213 343 154 282 481 219
30 1 NA NA 24 86 108 47 126 187 80 193 347 124 259 492 183
  2 NA NA 31 91 119 57 132 203 93 201 366 142 269 518 205
  3 NA NA 35 95 127 65 138 216 105 209 381 160 277 540 229
50 1 NA NA 24 85 113 50 124 204 87 188 392 139 252 567 208
  2 NA NA 31 89 123 60 130 218 100 196 408 158 262 588 230
  3 NA NA 35 94 131 68 136 231 112 205 422 176 271 607 255
100 1 NA NA 23 84 104 49 122 200 89 182 410 151 243 617 232
  2 NA NA 30 88 115 59 127 215 102 190 425 169 253 636 254
  3 NA NA 34 93 124 67 133 228 115 199 438 188 262 654 279
  COMMON VENT CAPACITY
MINIMUM INTERNAL AREA OF MASONRY CHIMNEY FLUE (square inches)
12 19 28 38 50
COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
6 NA NA 25 NA 118 45 NA 176 71 NA 255 102 NA 348 142
8 NA NA 28 NA 128 52 NA 190 81 NA 276 118 NA 380 162
10 NA NA 31 NA 136 56 NA 205 89 NA 295 129 NA 405 175
15 NA NA 36 NA NA 66 NA 230 105 NA 335 150 NA 400 210
20 NA NA NA NA NA 74 NA 247 120 NA 362 170 NA 503 240
30 NA NA NA NA NA NA NA NA 135 NA 398 195 NA 558 275
50 NA NA NA NA NA NA NA NA NA NA NA NA NA 612 325
100 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 square inch = 0.000645 m2
* NA: Not applicable.
TABLE 510.2(4)
MASONRY CHIMNEY [NFPA 54: TABLE 13.2(d)] (continued)*
  NUMBER OF APPLIANCES: TWO OR MORE
APPLIANCE TYPE: CATEGORY I
APPLIANCE VENT CONNECTION: SINGLE-WALL METAL CONNECTOR
  VENT CONNECTOR CAPACITY
SINGLE-WALL METAL VENT CONNECTOR DIAMETER — D (inch)
8 9 10
APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
CONNECTOR RISE
R
(feet)
FAN NAT FAN NAT FAN NAT
Min Max Max Min Max Max Min Max Max
6 1 292 366 200 362 474 252 499 594 316
  2 301 432 231 373 557 299 509 696 376
  3 309 491 269 381 634 348 519 793 437
8 1 313 407 207 387 530 263 529 672 331
  2 323 465 238 397 607 309 540 766 391
  3 332 509 274 407 663 356 551 838 450
10 1 333 434 213 410 571 273 558 727 343
  2 343 489 244 420 640 317 569 813 403
  3 352 530 279 430 694 363 580 880 459
15 1 349 502 225 445 646 291 623 808 366
  2 359 548 256 456 706 334 634 884 424
  3 368 586 289 466 755 378 646 945 479
20 1 345 569 235 439 734 306 614 921 387
  2 355 610 266 450 787 348 627 986 443
  3 365 644 298 461 831 391 639 1042 496
30 1 338 665 250 430 864 330 600 1089 421
  2 348 699 282 442 908 372 613 1145 473
  3 358 729 312 452 946 412 626 1193 524
50 1 328 778 287 417 1022 383 582 1302 492
  2 339 806 320 429 1058 425 596 1346 545
  3 349 831 351 440 1090 466 610 1386 597
100 1 315 875 328 402 1181 444 560 1537 580
  2 326 899 361 415 1210 488 575 1570 634
  3 337 921 392 427 1238 529 589 1604 687
  COMMON VENT CAPACITY
MINIMUM INTERNAL AREA OF MASONRY CHIMNEY FLUE (square inches)
63 78 113
COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
FAN
+FAN
FAN
+NAT
NAT
+NAT
6 NA 455 187 NA 579 245 NA 846 NA
8 NA 497 217 NA 633 277 1136 928 405
10 NA 532 234 771 680 300 1216 1000 450
15 677 602 280 866 772 360 1359 1139 540
20 765 661 321 947 849 415 1495 1264 640
30 808 739 377 1052 957 490 1682 1447 740
50 NA 821 456 1152 1076 600 1879 1672 910
100 NA NA 494 NA NA 663 2006 1885 1046
For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 square inch = 0.000645 m2
* NA: Not applicable.
TABLE 510.2(5)
SINGLE-WALL METAL PIPE OR TYPE B ASBESTOS-CEMENT VENT [NFPA 54: TABLE 13.2(e)]*
    NUMBER OF APPLIANCES: TWO OR MORE
APPLIANCE TYPE: DRAFT HOOD-EQUIPMENT
APPLIANCE VENT CONNECTION: DIRECT TO PIPE OR VENT
VENT CONNECTOR CAPACITY
VENT CONNECTOR DIAMETER — D (inch)
TOTAL VENT
HEIGHT
H
(feet)
CONNECTOR
RISE
R
(feet)
3 4 5 6 7 8
APPLIANCE INPUT RATING IN THOUSANDS OF BTU PER HOUR
  1 21 40 68 102 146 205
6-8 2 28 53 86 124 178 235
  3 34 61 98 147 204 275
  1 23 44 77 117 179 240
15 2 30 56 92 134 194 265
  3 35 64 102 155 216 298
30
and up
1 25 49 84 129 190 270
2 31 58 97 145 211 295
3 36 68 107 164 232 321
  COMMON VENT CAPACITY
COMMON VENT DIAMETER — D (inch)
TOTAL VENT
HEIGHT
H
(feet)
4 5 6 7 8 10 12
COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU PER HOUR
6 48 78 111 155 205 320 NA
8 55 89 128 175 234 365 505
10 59 95 136 190 250 395 560
15 71 115 168 228 305 480 690
20 80 129 186 260 340 550 790
30 NA 147 215 300 400 650 940
50 NA NA NA 360 490 810 1190
For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 square inch = 0.000645 m2
* NA: Not applicable.
TABLE 510.2(6)
EXTERIOR MASONRY CHIMNEY [NFPA 54: TABLE 13.2(f)]*
  NUMBER OF APPLIANCES: TWO OR MORE
APPLIANCE TYPE: NAT + NAT
APPLIANCE VENT CONNECTION: TYPE B DOUBLE-WALL CONNECTOR
COMBINED APPLIANCE MAXIMUM INPUT RATING IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
INTERNAL AREA OF CHIMNEY (square inches)
12 19 28 38 50 63 78 113
6 25 46 71 103 143 188 246 NA
8 28 53 82 119 163 218 278 408
10 31 56 90 131 177 236 302 454
15 NA 67 106 152 212 283 365 546
20 NA NA NA NA NA 325 419 648
30 NA NA NA NA NA NA 496 749
50 NA NA NA NA NA NA NA 922
100 NA NA NA NA NA NA NA NA
For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 square inch = 0.000645 m2
* NA: Not applicable.
TABLE 510.2(7)
EXTERIOR MASONRY CHIMNEY [NFPA 54: TABLE 13.2(g)]1, 2
  NUMBER OF APPLIANCES: TWO OR MORE
APPLIANCE TYPE: NAT + NAT
APPLIANCE VENT CONNECTION: TYPE B DOUBLE-WALL CONNECTOR
MINIMUM ALLOWABLE INPUT RATING OF SPACE-HEATING APPLIANCE IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
INTERNAL AREA OF CHIMNEY (square inches)
12 19 28 38 50 63 78 113
Local 99% winter design temperature: 37°F or greater
6 0 0 0 0 0 0 0 NA
8 0 0 0 0 0 0 0 0
10 0 0 0 0 0 0 0 0
15 NA 0 0 0 0 0 0 0
20 NA NA NA NA NA 184 0 0
30 NA NA NA NA NA 393 334 0
50 NA NA NA NA NA NA NA 579
100 NA NA NA NA NA NA NA NA
Local 99% winter design temperature: 27°F to 36°F
6 0 0 68 NA NA 180 212 NA
8 0 0 82 NA NA 187 214 263
10 0 51 NA NA NA 201 225 265
15 NA NA NA NA NA 253 274 305
20 NA NA NA NA NA 307 330 362
30 NA NA NA NA NA NA 445 485
50 NA NA NA NA NA NA NA 763
100 NA NA NA NA NA NA NA NA
Local 99% winter design temperature: 17°F to 26°F
6 NA NA NA NA NA NA NA NA
8 NA NA NA NA NA NA 264 352
10 NA NA NA NA NA NA 278 358
15 NA NA NA NA NA NA 331 398
20 NA NA NA NA NA NA 387 457
30 NA NA NA NA NA NA NA 581
50 NA NA NA NA NA NA NA 862
100 NA NA NA NA NA NA NA NA
Local 99% winter design temperature: 5°F to 16°F
6 NA NA NA NA NA NA NA NA
8 NA NA NA NA NA NA NA NA
10 NA NA NA NA NA NA NA 430
15 NA NA NA NA NA NA NA 485
20 NA NA NA NA NA NA NA 547
30 NA NA NA NA NA NA NA 682
50 NA NA NA NA NA NA NA NA
100 NA NA NA NA NA NA NA NA
Local 99% winter design temperature: 4°F or lower
Not recommended for any vent configurations
For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 square inch = 0.000645 m2, °C = (°F—32)/1.8
Notes:
1 See Figure 510.1.10 for a map showing local 99 percent winter design temperatures in the United States.
2 NA: Not applicable.
TABLE 510.2(8)
EXTERIOR MASONRY CHIMNEY [NFPA 54: TABLE 13.2(h)]*
  NUMBER OF APPLIANCES: TWO OR MORE
APPLIANCE TYPE: FAN + NAT
APPLIANCE VENT CONNECTION: TYPE B DOUBLE-WALL CONNECTOR
COMBINED APPLIANCE MAXIMUM INPUT RATING IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
INTERNAL AREA OF CHIMNEY (square inches)
12 19 28 38 50 63 78 113
6 74 119 178 257 351 458 582 853
8 80 130 193 279 384 501 636 937
10 84 138 207 299 409 538 686 1010
15 NA 152 233 334 467 611 781 1156
20 NA NA 250 368 508 668 858 1286
30 NA NA NA 404 564 747 969 1473
50 NA NA NA NA NA 831 1089 1692
100 NA NA NA NA NA NA NA 1921
For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 square inch = 0.000645 m2
* NA: Not applicable.
TABLE 510.2(9)
EXTERIOR MASONRY CHIMNEY [NFPA 54: TABLE 13.2(i)]1, 2
  NUMBER OF APPLIANCES: TWO OR MORE
APPLIANCE TYPE: FAN + NAT
APPLIANCE VENT CONNECTION: TYPE B DOUBLE-WALL CONNECTOR
MINIMUM ALLOWABLE INPUT RATING OF SPACE-HEATING APPLIANCE IN THOUSANDS OF BTU PER HOUR
VENT HEIGHT
H
(feet)
INTERNAL AREA OF CHIMNEY (square inches)
12 19 28 38 50 63 78 113
Local 99% winter design temperature: 37°F or greater
6 0 0 0 0 0 0 0 0
8 0 0 0 0 0 0 0 0
10 0 0 0 0 0 0 0 0
15 NA 0 0 0 0 0 0 0
20 NA NA 123 190 249 184 0 0
30 NA NA NA 334 398 393 334 0
50 NA NA NA NA NA 714 707 579
100 NA NA NA NA NA NA NA 1600
Local 99% winter design temperature: 27°F to 36°F
6 0 0 68 116 156 180 212 266
8 0 0 82 127 167 187 214 263
10 0 51 97 141 183 201 225 265
15 NA 111 142 183 233 253 274 305
20 NA NA 187 230 284 307 330 362
30 NA NA NA 330 319 419 445 485
50 NA NA NA NA NA 672 705 763
100 NA NA NA NA NA NA NA 1554
Local 99% winter design temperature: 17°F to 26°F
6 0 55 99 141 182 215 259 349
8 52 74 111 154 197 226 264 352
10 NA 90 125 169 214 245 278 358
15 NA NA 167 212 263 296 331 398
20 NA NA 212 258 316 352 387 457
30 NA NA NA 362 429 470 507 581
50 NA NA NA NA NA 723 766 862
100 NA NA NA NA NA NA NA 1669
Local 99% winter design temperature: 5°F to 16°F
6 NA 78 121 166 214 252 301 416
8 NA 94 135 182 230 269 312 423
10 NA 111 149 198 250 289 331 430
15 NA NA 193 247 305 346 393 485
20 NA NA NA 293 360 408 450 547
30 NA NA NA 377 450 531 580 682
50 NA NA NA NA NA 797 853 972
100 NA NA NA NA NA NA NA 1833
Local 99% winter design temperature: —10°F to 4°F
6 NA NA 145 196 249 296 349 484
8 NA NA 159 213 269 320 371 494
10 NA NA 175 231 292 339 397 513
15 NA NA NA 283 351 404 457 586
20 NA NA NA 333 408 468 528 650
30 NA NA NA NA NA 603 667 805
50 NA NA NA NA NA NA 955 1003
100 NA NA NA NA NA NA NA NA
Local 99% winter design temperature: -11°F or lower
Not recommended for any vent configurations
For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 square inch = 0.000645 m2, °C = (°F—32)/1.8
Notes:
1 See Figure 510.1.10 for a map showing local 99 percent winter design temperatures in the United States.
2 NA: Not applicable.
SEE MORE

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