10
0
1
2
2
½
3
4
5
6
7
8
9
1
0
2
0
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
2
0
1
9
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
1
9
1
8
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
1
8
1
7
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
1
7
1
6
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
B
N
U
1
6
1
5
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
1
5
1
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
1
4
1
3
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
1
3
1
2
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
1
2
1
1
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
1
1
1
0
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
1
0
9
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
9
8
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
8
7
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
7
6
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
A
4
6
5
A
N
U
A
N
U
A
N
U
A
N
U
A
N
U
A
N
U
A
N
U
A
N
U
A
N
U
A
N
U
A
N
U
5
4
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
4
3
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
3
2
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
2
1
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
1
0
N
U
N
U
N
U
N
U
N
U
N
U
N
U
N
U
0
0
1
2
2
½
3
4
5
6
7
8
9
1
0
VERTICAL RISE IN FEET
H
O
R
IZ
O
N
T
A
L
R
U
N
I
N
FE
E
T
EXHAUST RESTRICTOR
A or B
NU = NOT USED
AIR RESTRICTOR
1— 6 TABS OPEN
NU = NOT USED
KEY
VERTICAL TERMINA-
TIONS NOT ALLOWED
N
O
T
A
L
L
O
W
E
D
NATURAL GAS VENTING CHART