10
139467_03 GF 370 DV II June 2015
Horizontal Termination
M
inimum vertical rise
from the vent collar is a 24”
section vent pipe. See fig. 9. Minimum horizontal
run is 12” with natural gas and 18” with propane.
A maximum of two 90° or four 45° elbows may
be used in a horizontal termination. Whenever
possible, use 45° elbows instead a 90° elbow as
they offer less restriction to the flow of flue gases
and intake air.
Reduce the overall horizontal run
by 5 feet for
each
additional elbow, whether 45° or
90°.
Snorkel Termination - ( 14” or 36”):
NATURAL GAS ONLY. DO NOT USE SNORKEL
TERMINATION WITH PROPANE FUEL.
A horizontal vent run may be made with a
90
°
elbow directly to the rear of the stove only when
terminated by a 14 or 36 inch snorkel cap.
Fig. 10
shows the minimum vent pipe requirements.
14” Snorkel:
The maximum horizontal vent run
must not exceed a 24” section of pipe and must be
a minimum of 12”.
36” Snorkel:
The maximum horizontal vent run
must not exceed 5 feet and must be a minimum
of 12”.
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.
Wall Cut-out:
A minimum 10” X 10” square hole
is adequate for proper pipe clearance through a
wall, provided the vent is positioned to maintain
2” minimum clearance at the top. A 1” minimum
clearance must be maintained to combustible
material around the other sides. See fig. 11.
Any horizontal run of vent must have a 1/4” rise for
every foot of run toward the termination cap.
All horizontal terminations must comply with the
clearance specifications to adjacent structures as
indicated in fig. 12.
Installation of a Vinyl Siding Standoff is required
to prevent damage to vinyl siding between the
vent cap and the exterior wall.
A 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 fig. 13.
Vinyl siding projections require a default clearance of
18” to the vent terminal.
Figure 10. Minimum vent
pipe sections required for a 14”
Snorkel termination -
Natural
Gas ONLY.
.
Figure 9. Minimum vent
pipe sections required for
horizontal termination:
A = 12” with NG
18” with LP
Figure 11. Install a
listed wall thimble
according to manu-
facturer’s instructions
to maintain required
clearance to combus-
tible materials.
Listed Wall
Thimble
Listed Wall
Thimble
NG
ONLY
