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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.
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. If the vertical run is 7
more, the clearance is 1" on sides of the horizontal
run.
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 hori-
zontal run. For each 45° elbow used on the horizon-
tal plane, the maximum horizontal length must be
reduced by 18" (450 mm).
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' (2.5m) 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. Figure
24
•
The maximum angular variation allowed in the system
is 270°. 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
/
ft. or
2
12"
Figure 24 - Maximum Elbow Usage
Maximum
12"
Support Straps
Figure 23 - Support Straps for
Horizontal Runs
1
3
4
10'
Every 3'
74D0009
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