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12
C
L
Horizontal Termination
The horizontal termination cap must maintain a
3” clearance to any overhead combustible
projections that are 2 1/2” or less. It must also
maintain a 12” clearance from projections that
exceed 2 1/2”. See Figure 9.
Minimum vertical rise from the top exit position
is a 24” section vent pipe. See Fig. 10.
A horizontal vent run made directly off the rear
of the stove must terminate ONLY with a 36”
Snorkel Cap.
The maximum horizontal run shall include no
more than a single 24” section of pipe. See
Figure 11.
The termination cap must not be recessed into the
wall or siding. Do not fill air space in wall around
termination cap with any type of insulation.
A minimum 11” X 11” square hole is required for
the proper pipe clearance through a wall pen-
etration. A 10” x 10” opening is suitable with use
of Simpson Dura-Vent Wall Thimble #942.
Any horizontal run of vent must be level or have
a 1/4” rise for every foot of run toward the
termination cap.
Prevent potential damage to vinyl siding with
installation of a Vinyl Siding Standoff between
the vent cap and the exterior wall.
Standard Horizontal
termination cap
(#984, #985)
Minimum vertical
rise with horizontal
termination: 24”
Maximum
horizontal with 2
ft. vertical is 12”
90° Elbow
(#990B)
Figure 10. A vertical run in a horizontal termination
must be at least 2 feet (61 cm).
Figure 11. Rear Exit Horizontal Termination.
36” Snorkel
Maximum horizontal
run into a 36” Snorkel:
24” (610 mm )
Rear Exit
Position
24 ”
610 mm
58 1/2”
(148.6 cm)
center line
with required
2ft. rise and
90° elbow