A.O. Smith ATX-199 Instruction Manual page 34

TERMINATION CLEARANCES FOR SIDEWALL INSTALLATIONS
D
E
L
Table 18. Vent Termination Clearances for Direct Vent and Other Vent Systems
A
B
C
D
E
F
G
H
I
J
K
L
M
B
C
Fixed
V
closed
Operable
V
F
B
Figure 35. Vent Termination Clearances
-
CSA B149.1, Natural Gas and Propane Installation Code
ANSI Z223.1/NFPA 54, National Fuel Gas Code
Inside corner
V = Vent terminal
detail
X = Air supply inlet
G
= Area where the terminal
V
A
B
B
V
Fixed
Operable
V closed
X
B
V
B
J
A
Canada Installations
Direct Vent/Other Than
Direct Vent
0
34
H
M
X
V
I
K
Regulator/Gas meter
vent outlet
1
US Installations
Direct vent
1 ft
0
*
*
2
Other Than
Direct Vent
0
*
*