34
Appendix
XG0799 - 081319
Openable
Fixed
closed
Fixed
closed
Power vent termination
Combustion air termination
Inline Terminations
Location
Canada*
USA**
A
Clearance above grade, veranda, porch, or balcony
30 inches
30 inches
B
Clearance to top of doors or operable windows
4 feet
4 feet
C
Clearance to sides or bottom of doors or operable windows
36 inches
12 inches
D
Clearance to permanently closed window when installed with approved gas penetration termination
Not Required
Not Required
E
Recommended clearance to permanently closed window to prevent condensation
30 inches
30 inches
F
Clearance to soffit
22 inches
22 inches
G
Clearance to outside corner
Not Required
Not Required
H
Clearance to inside corner
6 inches
6 inches
I
Clearance to the vertical centerline of a meter or regulatory assembly to a max vertical distance of 15 feet
3 feet
3 feet
J
Clearance to service regulator vent outlet
3 feet
3 feet
K
Clearance to non-mechanical air supply inlet to the building or combustion air inlet for another appliance
3 feet
3 feet
L
Clearance above forced air supply inlet or Montigo combustion air termination
3 feet
3 feet
M
Clearance to sides or bottom of Montigo combustion air termination
6 inches
6 inches
N
Clearance above paved sidewalk or paved driveway located on public property
7 feet
7 feet
P+
Clearance under veranda, porch, deck, or balcony
12 inches
12 inches
Q++ Clearance above roof
2 feet
2 feet
R
Clearance to adjacent walls and neighbouring buildings
30 inches
30 inches
S
Clearance from corner in recessed location
30 inches
30 inches
T
Maximum depth of recessed location
48 inches
48 inches
U
Maximum width for back wall of recessed location
60 inches
60 inches
V
Horizontal clearance between two terminations
12 inches
12 inches
* Based on CGA B149.1 Natural
Gas and Propane Installation Code.
Local codes may vary, please check
with local regulatory agency.
**Based on ANSI Z223.1/NFPA 54
National Fuel Gas Code. Local
codes may vary, please check with
local regulatory agency.
+ A vent shall not terminate
directly above a sidewalk or paved
driveway which is located between
2 single family dwellings and
serves both dwellings.
++ Permitted only if veranda/
porch/deck/balcony is fully open
on a minimum of 2 sides
beneath the floor.
A
B
C
C
D
E
L
M
H
N
G
F
V
I
P
K
J
M
C
C
U
S
T
I
Q
R
V
