22
Outdoor Lifestyles by Hearth & Home Technologies • Fortress - ODFORTG-36 Installation Manual • 4602-901 Rev B • 8/17
•
Do not back fill around snorkel.
•
A clearance of at least 4" must be
maintained between the snorkel and the
soil.
Install restrictor disc as shown in
Figure 20
for vertically
vented applications. Up to two (2) restrictor discs may be
needed for 40' installation. The two (2) restrictor discs
suppled will work for most installations. If a third disc is
needed order part number 56D3027.
Vertical Through-the-Roof Applications
NOTICE:
A restrictor disc must be installed on
vertical terminations that are higher than 12' (366
cm).
FP2707
restrictor disc
Restrictor Disc
Fireplace Collar
Figure 5.11 Install Restrictor Disc into Fireplace Collar
This gas fireplace has been approved for vertical installa
-
tions up to 40' (12 m) in height. Up to a 20' (6 m) horizontal
vent run can be installed within the vent system using a
maximum of two 90° elbows. See Figure 5.12.
NOTE:
Horizontal sections of this vent system require a
minimum of 3" clearances to combustibles at the top of
the flue and 1" clearance at the sides and bottom until the
flue penetrates the outside wall. A minimum 1" clearance
all around the flue is acceptable at this point of penetration.
Unless the vertical run is 7
1
⁄
2
feet or higher form floor of
fireplace, the clearance for the horizontal run is 1" on all
sides.
Vertical sections of this vent system require a minimum
of 1" clearance to combustibles on all sides of the pipe.
•
Up to two 45° elbows may be used within the horizontal
run. For each 45° elbow used on the horizontal plane,
the maximum horizontal length must be reduced by 18"
(457 mm).
B
A
40' (12 m) Maximum Height
12' (3.7 m) Minimum Height
Support Straps
Every 3'
FP1387a
Figure 5.12 Allowable Horizontal Runs with Vertical Rises
and Terminations
10 12 14 16 18 20
5
6
7
8
9
10
11
FP2917
vert horiz vent graph
A: Vertical
dimension from
the floor to the
center of the
horizontal vent
pipe.
B: Length of horizontal pipe section
before vertical elbow.
(Dimensions in feet)
Example:
If the vertical dimension from the floor of the
fireplace is 8
1
⁄
2
' (2.6 m), the horizontal run to vertical
elbow must not exceed 16' (4.9 m).
Example:
Maximum horizontal length
No elbows = 10’ (3 m)
1x45° elbows = 8.5’ (2.6 m)
2x45° elbows = 7’ (2.1 m)
•
A minimum of an 8' (2.5 m) vertical rise is required.
•
Two sets of 45°elbows offsets may be used within the
vertical sections. From 0 to a maximum of 8' (2.5 m)
of vent pipe can be used between elbows. See Figure
5.13
.
•
The maximum angular variation allowed in the system
is 270°. See Figure 5.13.
•
For the minimum height of the vent above the highest
point of penetration through the roof refer to Page 24,
Figure 5.17.
WARNING
