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VENT INSTALLATION
VERTICAL (THROUGH-THE-ROOF) APPLICA-
TIONS
This Gas Fireplace has been approved for,
• Vertical installations up to 40' (12m) in height. Up to a 10'
(3m) horizontal vent run can be installed within the vent
system using a maximum of two 90° elbows. See Figure
23.
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.
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"
(450mm).
Example: Maximum horizontal length
No elbows = 10' (3m)
1x45° elbows = 8.5' (2.6m)
2x45° elbows = 7' (2.1m)
• A minimum of an 8' (2.5m) 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 24.
• The maximum angular variation allowed in the system is
270°. See Figure 24.
• The minimum height of the vent above the highest point
of penetration through the roof is 2' (610mm).
Example:
Total Angular Variation =
Elbow 1 =
90°
Elbow 2 =
45°
Elbow 3 =
45°
Elbow 4 =
90°
270°
40' Maximum Height
8' Minimum Height
1"
Figure 23 - Support Straps for
Horizontal Runs
1
3
4
1"
Figure 24 - Maximum Elbow Usage
10'
Maximum
Support Straps
Every 3'
74D0010
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