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10
VER
TICAL
RISE IN F
EET
HORIZONTAL RUN IN FEET
EXHAUST RESTRICTOR
C or D
NU= NOT USED
AIR RESTRICTOR
1/2 — 3 TABS OPEN
NU = NOT USED
KEY
NATURAL GAS VENTING CHART
C
30
D
1/2
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
30
29
D
1/2 D
1/2
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
29
28
D
1/2 D
1/2 D
1/2
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
28
27
D
1/2 D
1/2 D
1/2 D
1/2
X
X
X
X
X
X
X
X
X
X
X
X
X
X
27
26
D
1
D
1
D
1
D
1
D
1
X
X
X
X
X
X
X
X
X
X
X
X
26
25
D
1
D
1
D
1
D
1
D
1
D
1
X
X
X
X
X
X
X
X
X
X
25
24
D
1
D
1
D
1
D
1
D
1
D
1
D
1
X
X
X
X
X
X
X
X
24
23
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
X
X
X
X
X
X
23
22
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
X
X
X
X
22
21
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
X
X
21
20
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
20
19
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
19
18
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
18
17
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
17
16
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
16
15
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
15
14
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
14
13
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
D
1 1/2
13
12
D
2
D
2
D
2
D
2
D
2
D
2
D
2
D
2
D
2
D
2
D
2
12
11
D
2
D
2
D
2
D
2
D
2
D
2
D
2
D
2
D
2
D
2
D
2
11
10
D
2 1/2
D
2 1/2
D
2 1/2
D
2 1/2
D
2 1/2
D
2 1/2
D
2 1/2
D
2 1/2
D
2 1/2
D
2 1/2
D
2 1/2
10
9
X
X
D
2 1/2
D
2 1/2
D
2 1/2
D
2 1/2
D
2 1/2
D
2 1/2
D
2 1/2
D
2 1/2
D
2 1/2
D
2 1/2
9
8
X
X
D
3
D
3
D
3
D
3
D
3
D
3
D
3
D
3
D
3
D
3
8
7
X
X
D
3
D
3
D
3
D
3
D
3
D
3
D
3
D
3
D
3
D
3
7
6
X
X
C
3
C
3
C
3
C
3
C
3
C
3
C
3
C
3
C
3
C
3
6
5
X
X
C
3
C
3
C
3
C
3
C
3
C
3
C
3
C
3
C
3
C
3
5
4
X
X
C
3
C
3
C
3
C
3
C
3
C
3
C
3
C
3
C
3
C
3
4
3
X
X
C
NU C
NU C
NU C
NU C
NU C
NU C
NU C
NU C
NU C
NU
3
2
X
X
C
NU C
NU C
NU C
NU C
NU C
NU C
NU C
NU C
NU C
NU
2
1
X
X
NU NU NU NU NU NU NU NU NU NU NU NU NU NU NU NU NU NU NU NU
1
0
NU NU NU NU
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
1
2
3
4
10
10
6
7
8
5
9
6
7
8
9
5
0
1
2
3
4
V
E
RT
ICA
L T
E
RMIN
A
T
IO
NS
NO
T
A
LL
O
W
E
D
NOT ALLOWED
Summary of Contents for Fire Ribbon
Page 1: ......
Page 15: ...15 VENT TERMINAL CLEARANCES Venting terminals shall not be recessed into a wall or siding...
Page 33: ...33...