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14
Horizontal Termination
Any horizontal termination must fall within the
shaded portion of the vent window graph illustrated
in figs. 9 or 11. For Snorkel Terminations, see below.
Any horizontal termination except a snorkel termination,
must include:
1) Minimum rise of 24 in.
2) Minimum horizontal run of 12 in. when vertical
run is less than 8 ft.
3) Vertical run no more than 35 ft.
4) Horizontal run no more than 27 ft.
5) No more than four 45° or two 90° Elbows
The horizontal termination cap must maintain a 3"
clearance to any overhead combustible projections
2 1/2" or less. It must also maintain 12" clearance
from projections exceeding 2 1/2". See fig. 21.
Wall Cut-out Opening: A minimum 10" X 10" (250 mm x
250 mm) square hole is required for proper pipe clear-
ances through a combustible wall.
DO NOT FILL AIR SPACE WITH ANY TYPE OF INSULATION.
Any horizontal run of vent must be level or have a
1/4 in. rise for every foot of run toward the termina-
tion cap. NEVER ALLOW THE VENTING TO RUN DOWN-
WARD FROM STOVE TO TERMINATION; DOWNWARD
VENT RUNS TRAP HEAT AND CAUSE HIGH TEMPERA-
TURES TO DEVELOP WITHIN THE VENT THAT COULD
START A FIRE.
Install a Vinyl Siding Standoff (Simpson Dura-Vent
#950) between the vent termination and an exterior
wall covered by vinyl siding material to prevent
potential heat damage to the siding.
Do not recess the termination cap into a wall or
siding.
Figure 17.
• Minimum vent for horizontal termination.
• 14” Maximum horizontal run directly off rear of stove
with 14” Snorkel termination.
Figure 18. Maximum Horizontal with 36” Snorkel Termination.
Figure 19. Corner Installation with 14” Snorkel Termination.
Snorkel Terminations
With a 14” Snorkel:
The horizontal run made directly off the rear of the
stove into a 14” snorkel cap should include no more
than a single 12” straight section as shown in fig. 17.
One 45° Elbow may be used for a corner installation as
shown in fig. 19.
With a 36” Snorkel:
The maximum horizontal run may be no more than
6 ft. (182 cm.)
12 in.
Straight Pipe
Max.
14”
355 mm
Wall Thimble
and Trim Collar
45° Elbow
See Note F
Fig. 20
Max.
6 ft.
183 cm
36 in.
Snorkel
(915 mm)
C
L
25”
635 mm
56 1/2”
1435 mm
14”
335 mm
Max.
12”
vent
pipe or
less
12”
305
mm
24”
610 mm