A 1 inch (25 mm) clearance to combustibles must be maintained
around any vertical vent pipe. Around a horizontal vent pipe, the
clearance to combustibles should be 2 inches (50 mm) for rigid &
43⁄8 inches (111 mm) for flex above, and 11⁄2 inches (38 mm) on the
sides and bottom. When combustible materials are directly above
a 90° elbow & above the unit, 8 inches (203 mm) of clearance are
necessary; when not above the unit, 3 inches (76 mm) for rigid
pipe & 43⁄8 inches (111 mm) for flex pipe. A 10 inches (250 mm) x
10 inches (250 mm) frame (see Figure 30) will assure the proper
support and spacing for a vent pipe through the ceiling or as it
passes through the wall [up to 8 inches (203mm) for flex pipe].
Installations in Canada require that a wall thimble be used for
passing through walls and ceilings, see Figure 33. All sealing and
vapour barriers must comply with local building codes.
Figure 30. Vent Framing Through the Wall or Ceiling.
Figure 29. Vent Pipe Clearances.
Initial Installation
QUALIFIED INSTALLERS ONLY
When planning an installation, it is necessary to select the proper length of vent pipe for the particular
requirements. The configuration of the venting pipes depends on the locations of walls, ceilings and studs.
However, the pipes cannot be of arbitrary length and arrangement. Because the length of the vertical
and horizontal sections dramatically affects the burning efficiency of the fireplace, certain guidelines have
been set in the Vent Configurations section.
Venting terminals cannot be recessed into a wall or siding.
Table 7. Vent Pipe Minimum Clearances.
Vertical Pipe
to the Side
Walls
Horizontal Pipe
to the Sides &
Bottom
Above an
Elbow Above
the Unit
Above an Elbow
Not Above the
Unit
Above
Horizontal Vent
Pipe
Wall Frame
8”(203mm) or
less
Hard
Pipe
1”
(25.4 mm)
11⁄2”
(38.1 mm)
8”
(203 mm)
3”
(76.2 mm)
2”
(51 mm)
10”x10”
(25x25cm)
Flex
Pipe
1”
(25.4 mm)
11⁄2”
(38.1 mm)
8”
(203 mm)
4 3/8”
(111 mm)
4 3/8”
(111 mm)
10”x10”
(25x25cm)
2" (51mm)
8" (203mm)
46 1⁄4” (1175mm)
to a hard pipe
49 1⁄2” (1257mm)
to a flex pipe
Wall
Thimble
V
ENTING
:
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