Page 627 - 2018_IRC

FUEL GAS

NAT Max 85 70 68 66 64 62 59 95 81 79 77 74 72 67

Max 1,548 1,072 1,055 1,028 1,002 977 929 1,730 1,276 1,259 1,230 1,203 1,176 1,125
F Min 0 10 12 13 17 0 10 11 13 16
Connected directly to vent 9 NAT Max 6 5 5 5 4 4 4 7 6 6 5 5 5 5

Single Category I F Ma 1,17 82 81 78 76 74 70 1,29 97 96 93 91 88 84

Number of Appliances Appliance Type Appliance Vent Connection 8 NAT F Mi Max Ma 47 85 33 39 61 69 38 60 91 37 58 105 35 56 119 34 54 149 32 50 51 93 26 44 71 65 43 70 86 42 68 100 41 66 113 40 64 141 37 60

VENT DIAMETER—(D ) inches 7 APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H NAT F Mi Max Ma 33 58 27 28 43 58 27 42 77 26 40 90 24 38 102 23 37 131 21 34 36 63 22 31 49 55 30 48 73 29 47 85 28 45 97 27 44 123 25 41

NAT Mi Max 22 1 18 4 17 5 17 7 16 8 15 104 23 1 20 4 20 5 19 6 18 76 16 99

Ma 37 28 27 26 24 23 21 39 32 31 29 28 27 25
6
F NAT Mi Ma 12 1 11 3 10 4 10 5 9 6 9 88 13 1 12 3 11 4 11 5 63 84
TABLE G2428.2(1) [504.2(1)]—continued TYPE B DOUBLE-WALL GAS VENT 4 F NAT Ma Mi Ma 2 6 1 1 5 1 2 5 1 3 5 1 4 1 5 1 73 2 6 1 1 6 1 2 1 3 1 4 1 50 1 69 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W.

5

F
Mi Max 100 81 77 2 70 2 64 3 58 5 101 86 82 2 76 2 70 5

LATERAL (L) (feet) 0 2 5 1 1 2 30 0 2 5 1 1 20 30

3

HEIGHT (H) (feet) 30 50 For SI:

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