33
Appendix
XG0799 - 081319
Openable
Fixed
closed
Fixed
closed
Power vent termination
Combustion air termination
Appendix B: Power Vent Clearances
Roof/Wall 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
12 inches
12 inches
C
Clearance to sides or bottom of doors or operable windows
4 feet
4 feet
D
Clearance to permanently closed window when installed with approved gas penetration termination
0
0
E
Recommended clearance to permanently closed window to prevent condensation
30 inches
30 inches
F
Clearance to ventilated soffit located within 24 inches of termination
22 inches
22 inches
G
Clearance to unventilated soffit
30 inches
30 inches
H
Clearance to outside corner
30 inches
30 inches
I
Clearance to inside corner 30
30 inches
30 inches
J
Clearance to the vertical centerline of a meter or regulatory assembly to a max vertical distance of 15 feet
3 feet
3 feet
K
Clearance to service regulator vent outlet
3 feet
3 feet
L
Clearance to non-mechanical air supply
inlet to the building or combustion air
inlet for other appliance
for other appliance ≤ 100,000 BTU/H (30KW)
12 inches
4 feet
for other appliance ≥ 100,000 BTU/H (30KW)
6 feet
4 feet
M
Clearance to forced air supply inlet
6 feet
3 feet above inlet
N
Clearance between Montigo
combustion and exhaust terminations
for combustion termination beside or below exhaust vent
30 inches
30 inches
for combustion termination above exhaust vent
3 feet
3 feet
P+
Clearance above paved sidewalk or paved driveway located on public property
7 feet
7 feet
Q++ Clearance under veranda, porch, deck, or balcony
30 inches
30 inches
R
Clearance above roof
2 feet
2 feet
S
Clearance to adjacent walls and neighbouring buildings
30 inches
30 inches
T
Clearance from corner in recessed location
30 inches
30 inches
U
Maximum depth of recessed location
48 inches
48 inches
V
Maximum width for back wall of recessed location
60 inches
60 inches
W
Horizontal clearance between two terminations that are level
30 inches
30 inches
X
Horizontal clearance between two terminations that are not level
30 inches
30 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
G
C
C
D
E
F
H
I
J
K
L
M
P
Q
R
T
S
U
V
W
X
C
J
N
C
N
S
R
X