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FUEL GAS
NAT Max 1,545 1,308 1,283 1,234 1,205 1,166 1,101 1,818 1,509 1,490 1,455 1,421 1,387 1,318
Max 2,996 1,999 1,971 1,927 1,884 1,841 1,759 3,432 2,426 2,396 2,347 2,299 2,251 2,159
F Min 454 424 524 620 702 780 937 428 401 496 589 668 741 892
Single-wall metal connector NAT Max 1,056 863 846 821 794 768 720 1,189 1,007 991 963 934 906 848
2
1
Single Category I 0 1 F Max Min 1,971 312 1,346 296 1,324 366 1,287 440 1,251 507 1,216 570 1,147 704 2,223 295 1,615 280 1,591 347 1,551 418 1,512 481 1,473 544 1,399 674
Number of Appliances Appliance Type Appliance Vent Connection 9 NAT F NAT Max Max Min Max 852 1,542 229 647 698 1,069 219 533 684 1,049 269 521 662 1,017 327 501 638 985 379 481 615 955 433 461 574 895 541 426 948 1,724 220 704 811 1,273 209 613 795 1,252 257 602 765 1,217 313 583 736 1,183 363 562 708 1,150 415 543 649 1,086 521 502
VENT DIAMETER—(D ) inches 8 APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H F NAT Max Min Max Max 1,168 184 472 849 823 175 392 610 806 215 382 595 777 265 367 570 750 312 349 547 723 360 333 524 670 461 305 477 1,292 176 515 928 971 168 443 712 953 204 435 696 923 253 420 671 894 299 405 646 866 345 389 622 809 442 NA 573
NAT F Min Max 144 334 139 279 171 271 213 257 255 242 298 228 389 NA 138 361 133 312 164 305 203 292 244 280 285 267 373 NA
Max 584 429 417 397 377 357 NA 629 495 482 461 441 420 376
7
F NAT Min Max 110 219 109 183 136 173 171 168 208 157 246 NA NA NA 105 230 104 205 131 198 162 186 199 174 236 NA 315 NA
TABLE G2428.2(2) [504.2(2)]—continued TYPE B DOUBLE-WALL GAS VENT 5 F NAT F Max Min Max Max 372 76 127 211 281 76 111 164 271 98 106 157 255 122 98 144 239 151 NA 131 223 181 NA NA NA NA NA NA 394 73 133 213 318 73 121 181 308 94 117 174 292 118 NA 160 275 145 NA 148 257 176 NA NA NA NA NA NA
6
NAT
Max Min Max 53 63 99 55 56 80 72 52 74 91 NA NA 115 NA NA NA NA NA NA NA NA 51 66 99 53 61 84 70 NA 80 89 NA NA 112 NA NA NA NA NA NA NA NA For SI:1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W.
4
F
Min 34 37 49 NA NA NA NA 33 36 48 NA NA NA NA
LATERAL (L) (feet) 0 2 5 10 15 20 30 0 2 5 10 15 20 30
3
HEIGHT (H) (feet) 30 50
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