38
Initial Installation
QUALIFIED INSTALLERS ONLY
J
12 in (30 cm)
9 in (23 cm)
Clearance to non-mechanical air supply inlet to building, or
the combustion air inlet to any other appliance.
K
6 ft (1.83 m)
3 ft (91 cm) above if within 10
ft (3 m) horizontally
Clearance to mechanical air supply inlet.
L
7 ft (2.13 m)t
7 ft (2.13 m)*t
Clearance above paved sidewalk or paved driveway located
on public property.
M
30 in (76.2 cm)+
Clearance under verandah, porch, deck, or balcony.
N
12 in (30 cm)*
Clearance horizontally to any surface (such as an exterior
wall) for vertical terminations.
O
12 in (30 cm)
Clearance above roof line for vertical terminations.
1
In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2
In accordance with the current ANSI Z223.1 NFPA 54, National Fuel Gas Code.
* These numbers are only estimates.
t A vent shall not terminate directly above a side walk or paved driveway that is located between two single family dwellings and it
serves both dwellings.
+
Permitted only if verandah, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
Clearances must be in accordance with local installation codes and requirements of the gas supplier.
NOTE: Venting terminals shall not be recessed into walls or siding.
g
eneRaL
v
enting
c
LeaRances
:
A 1” (25 mm) clearance to combustibles must be maintained around any vertical vent pipe. Around a
horizontal vent pipe, the clearance to combustibles should be 3” (76 mm) above and 1” (25 mm) on
the sides and bottom. When combustible materials are directly above the first 90°
elbow, 5” (127 mm) of
clearance is necessary.
Vertical Pipe to
the Side Walls
Horizontal Pipe to
the Sides & Bottom
Above First
Elbow
Above Subsequent
Elbows
Above Horizontal
Vent Pipe
Wall Frame 8”
(203mm) or less
Hard
Pipe
1”
(25mm)
1”
(25 mm)
5”
(127mm)
3”
(76 mm)
3”
(76 mm)
3” top
(76mm)
See certified thimbles in venting section and
frame accordingly (see Figure 59 & Table 4). A thimble will
assure the proper support and spacing requirements for the vent pipe as it passes through the exterior wall.
Installations in Canada require that a wall thimble be used for passing through walls and ceilings. All sealing
and vapour barriers must comply with local building codes. Not all standard 8” thimbles can be used;
you MUST maintain 3” (76mm) clearance above a vent pipe running through a wall.
The framing clearance of the thimble will depend on the size of venting used. Refer to Table 4 for the proper
clearance dimensions. The offset of the thimble must be
ABOVE the vent pipe with the gap insulated.
The venting configuration depends on the locations of walls,
ceilings, and studs. However, the pipes cannot be of arbitrary length
and arrangement. Certain guidelines have been set
in “
I
nItIal
I
nstallatIon
- a
llowaBle
c
o
-a
xIal
V
ent
c
onfIGuratIons
”
because
the length of the vertical and horizontal sections dramatically
affects the burning efficiency of the fireplace.
x”
x”
Figure 59: Thimble Framing
Table 3: Vent Pipe Minimum Clearances
Vent Size Clearance (Height) Clearance (Width)
5” x 8”
12 1/2”
10 1/2”
8” x 11”
16 1/4”
14 1/4”
Table 4: Thimble Framing Clearances
