Page 626 - 2018_IRC
P. 626
FUEL GAS
NAT Max 47 37 36 35 53 41 40 39 58 45 44 42 68 54 52 50 49 75 61 59 57 55 53
Max 89 54 53 53 1,0 61 60 59 1,0 68 67 65 1,2 81 80 77 75 1,3 91 90 87 85 83
FAN Min 63 93 110 60 99 117 57 95 122 53 90 116 134 50 86 112 129 145
Connected directly to vent 9 NAT Ma 370 285 279 273 415 322 313 303 450 355 346 330 525 414 403 386 373 575 470 460 443 427 410
Single Category I F Ma 698 425 419 413 780 483 473 463 847 533 522 504 970 633 620 600 580 1,057 711 697 675 654 634
Number of Appliances Appliance Type Appliance Vent Connection 8 NAT F Min M Max 0 28 52 5 21 32 7 21 31 9 20 31 0 32 58 5 24 36 8 23 35 9 22 34 0 34 63 4 27 40 8 26 39 10 24 37 0 39 71 4 31 47 7 30 46 9 28 44 11 27 42 0 43 77 4 34 53 7 33 51 9 32 49 11 30 48 12 29 46
VENT DIAMETER—(D ) inches 7 APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H NAT F Min Max Max 0 20 37 4 15 23 6 15 22 7 14 22 0 23 41 4 18 26 7 17 25 8 16 24 0 25 44 4 19 28 6 18 28 8 17 26 0 28 50 3 22 33 6 21 33 8 20 31 9 19 30 0 30 54 3 24 37 6 24 36 8 22 35 9 21 33 10 20 32
NAT Mi Max 0 14 10 10 10 0 15 12 11 10 0 16 12 12 11 0 18 15 14 13 12 0 20 16 16 15 14 13 (continued)
Max 25 15 15 14 27 17 17 16 29 19 18 17 32 22 21 20 19 34 25 24 22 21 20
6
F
Mi Max 0 86 27 67 39 64 47 61 0 94 25 75 42 71 51 66 0 10 23 81 41 77 54 70 0 11 20 93 39 87 51 82 61 76 0 11 18 10 38 96 50 89 59 84 69 78
TABLE G2428.2(1) [504.2(1)] TYPE B DOUBLE-WALL GAS VENT 4 FAN NAT Max Mi Ma 15 0 46 97 18 36 94 30 34 91 36 32 16 0 50 10 16 40 10 32 38 98 39 35 17 0 53 11 17 42 11 32 40 10 41 36 19 0 58 13 15 48 13 30 45 12 40 41 11 48 37 20 0 61 14 14 51 14 29 48 13 38 44 12 46 40 11 55 35
NAT
5
F Ma 78 51 49 46 84 57 53 49 88 61 57 51 94 69 65 59 53 97 75 71 64 58 52
Min 13 21 25 12 23 28 12 23 30 11 22 29 35 10 21 28 34 48
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 ® 601
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