Form 433-CV/LN, Page 10
11. Venting (cont'd)
11B. Requirements and Instructions for Common Venting (cont'd)
Table 4A - Vent Connector Capacity
Nat Nat Nat Nat Nat Nat Nat 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
1 N/A N/A 21 N/A N/A 39 N/A N/A 66 179 191 100 231 271 140 292 366 200 362 474 252 499 594 316
2 N/A N/A 28 N/A N/A 52 N/A N/A 84 186 227 123 239 321 172 301 432 231 373 557 299 509 696 376
3 N/A N/A 34 N/A N/A 61 134 153 97 193 258 142 247 365 202 309 491 269 381 634 348 519 793 437
1 N/A N/A 21 N/A N/A 40 N/A N/A 68 195 208 103 250 298 146 313 407 207 387 560 263 529 672 331
2 N/A N/A 28 N/A N/A 52 137 139 85 202 240 125 258 343 177 323 465 238 397 607 309 540 766 391
3 N/A N/A 34 N/A N/A 62 143 156 98 210 264 145 266 376 205 332 509 274 407 663 356 551 838 450
1 N/A N/A 22 N/A N/A 41 130 151 70 202 225 106 267 316 151 333 434 213 410 571 273 558 727 343
2 N/A N/A 29 N/A N/A 53 136 150 86 210 255 128 276 358 181 343 489 244 420 640 317 569 813 403
3 N/A N/A 34 97 102 62 143 166 99 217 277 147 284 389 207 352 530 279 430 694 363 580 880 459
1 N/A N/A 23 N/A N/A 43 129 151 73 199 271 112 268 376 161 349 502 225 445 646 291 623 808 366
2 N/A N/A 30 92 103 54 135 170 88 207 295 132 277 411 189 359 548 256 456 706 334 634 884 424
3 N/A N/A 34 96 112 63 141 185 101 215 315 151 286 439 213 368 586 289 466 755 378 646 945 479
1 N/A N/A 23 87 99 45 128 167 76 197 303 117 265 425 169 345 569 235 439 734 306 614 921 387
2 N/A N/A 30 91 111 55 134 185 90 205 325 136 274 455 195 355 610 266 450 787 348 627 986 443
3 N/A N/A 35 96 119 64 140 199 103 213 343 154 282 481 219 365 644 298 461 831 391 639 1042 496
1 N/A N/A 24 86 108 47 126 187 80 193 347 124 259 492 183 338 665 250 430 864 330 600 1089 421
2 N/A N/A 31 91 119 57 132 203 93 201 366 142 269 518 205 348 699 282 442 908 372 613 1145 473
3 N/A N/A 35 95 127 65 138 216 105 209 381 160 277 540 229 358 729 312 452 946 412 626 1193 524
1 N/A N/A 24 85 113 50 124 204 87 188 392 139 252 567 208 328 778 287 417 1022 383 582 1302 492
2 N/A N/A 31 89 123 60 130 218 100 196 408 158 262 588 230 339 806 320 429 1058 425 596 1346 545
3 N/A N/A 35 94 131 68 136 231 112 205 422 176 271 607 255 349 831 351 440 1090 466 610 1386 597
1 N/A N/A 23 84 104 49 122 200 89 182 410 151 243 617 232 315 875 328 402 1181 444 560 1537 580
2 N/A N/A 30 88 115 59 127 215 102 190 425 169 253 636 254 326 899 361 415 1210 488 575 1570 634
3 N/A N/A 34 93 124 67 133 228 115 199 438 188 262 654 279 337 921 392 427 1238 529 589 1604 687
H -
Vent
Height
(ft)
100
Common Vent Tables 4A and 4B - Capacity of an Interior, Tile-Lined Masonry Chimney with Single-Wall Connectors Serving
Two or More Category I Appliances
NOTE: Category I appliance can be either Category I draft hood-equipped or fan-assisted type but must be approved for common venting.
Fan AssistFan Assist Fan Assist Fan Assist
50
6
8
10
15
20
30
Input Rating Limits in Thousands of BTUH
Fan AssistFan Assist Fan Assist Fan Assist
R - Vent
Connector
Rise (ft)
Single-Wall Vent Connector
3" Diameter 4" Diameter 9" Diameter 10" Diameter5" Diameter 6" Diameter 7" Diameter 8" Diameter
IMPORTANT: Do not use Table 4 for Model FT heater. It is published here only for determining the
vent connector length, vent height, and vent capacity of a Category I appliance that may use a single-
wall vent connector.
Table 4B - Common Vent Capacity
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
Fan +
Fan
Fan +
Nat
Nat +
Nat
Fan +
Fan
Fan +
Nat
Nat +
Nat
Fan +
Fan
Fan +
Nat
Nat +
Nat
6 N/A N/A 25 N/A 118 45 N/A 176 71 N/A 255 102 N/A 348 142 N/A 455 187 N/A 579 245 N/A 846 N/A
8 N/A N/A 28 N/A 128 52 N/A 190 81 N/A 276 118 N/A 380 162 N/A 497 217 N/A 633 277 1136 928 405
10 N/A N/A 31 N/A 136 56 N/A 205 89 N/A 295 129 N/A 405 175 N/A 532 234 771 680 300 1216 1000 450
15 N/A N/A 36 N/A N/A 66 N/A 230 105 N/A 335 150 N/A 400 210 677 602 280 866 772 360 1359 1139 540
20 N/A N/A N/A N/A N/A 74 N/A 247 120 N/A 362 170 N/A 503 240 765 661 321 947 849 415 1495 1264 640
30 N/A N/A N/A N/A N/A N/A N/A N/A 135 N/A 398 195 N/A 558 275 808 739 377 1052 957 490 1682 1447 740
50 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 612 325 N/A 821 456 1152 1076 600 1879 1672 910
100 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 494 N/A N/A 663 2006 1885 1046
113
Combined Input Rating of the Appliances in Thousands of BTUH
Minimum Internal Area of Masonry Chimney Flue (in
2
)
H -
Vent
Height
(ft)
7528 38 50 6312 19
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