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Venting Routes And Components
Since it is very important that the vent system maintain its balance
between the combustion air intake and the flue gas exhaust, cer-
tain limitations as to vent configurations apply and must be strictly
adhered to.
The table showing the relationship between vertical and horizontal
side wall venting will help to determine the various vent lengths.
The maximum horizontal run with the 90 degree bend at the fire-
place flue outlet is 4 ft/122cm (Figure #1). The maximum horizon-
tal run is 20 ft/6.1 m when the vertical run is 7 ft/2.1m (Figure #2).
Note: 1/4" vertical rise is required for every 12" of horizontal run.
The maximum number of 45 degree bends per side wall installa-
tion is two (2) in the horizontal run and then you must reduce the
length of the horizontal by 18 inches for each 45 degree bend.
The maximum vertical run is 40 ft/12.2 meters.
Special Note: For each 45 degree bend installed in the hori-
zontal run, the length of the horizontal run must be reduced
by 18" (45cm). This does not apply if the 45 degree bends are
installed on the vertical part of the vent system.
Example: If according to the table, the length of the horizontal run
is 10 feet, and two 45 degree bends are required, the horizontal
run length must be reduced to 7 feet.
2 additional 90° bends or equals are allowed. The horizontal run
must be reduced by 36" per each 90° bend, or 18" per each 45°
bend.
Important: Always locate the fireplace in such a way that a minimum of
offsets and/or horizontal runs are required. 1/4" vertical rise is required
for every 12" horizontal run.
45 1/2"
MINIMUM
20 FEET
How To Use The Horizontal Vent Table
1. Determine the height of the system and the number of bends
required.
2. Having determined the vertical distance determine the maxi-
mum horizontal section allowed.
3. Vent table has been established for 90˚ horizontal/vertical
runs. With use of flex pipe distance not having 90˚ bends will
not fall into vent table standards. See Fig. B.
Horizontal Venting Table From Bottom of Fireplace
for venting to a maximum of 40 ft. (12.2 meters)
Total Vertical
Feet
Meters
4
1.2
5
1.5
6
1.8
7
2.1
8
2.4
9
2.7
10
3.0
11
3.4
12
3.7
13
4.0
14
4.3
15
4.6
16
4.9
17
5.2
18
5.5
19
5.8
20
6.1
25
7.5
30
9
40
12.2
Example A:
If the vertical dimension
from the floor of the fire-
place is 6ft, the horizontal
run to the wall flange of the
vent termination must not
exceed 12ft.
NOTE: The final location
of the fireplace must be
such that the horizontal
vent dimensions fall with-
in those stated on the
graph. The Maximum
Vertical vent run is 40ft.
(12.2 meters).
Important: Minimum clear-
ance between vent pipes
and combustible materials is
1 inch (25mm).
It is recommended for Propane Horizontal Installations
that the venting should be a minimum of one foot vertical off
the flue before the elbow on any horizontal runs of one foot
or greater. This allows for cleaner combustion and greatly
reduces carboning and cleaning of glass.
Max Total Horizontal
Feet
Meters
5
1.5
8
1.2
12
3.7
20
6.1
20
6.1
20
6.1
20
6.1
20
6.1
20
6.1
20
6.1
20
6.1
20
6.1
20
6.1
20
6.1
20
6.1
20
6.1
20
6.1
15
4.6
10
3.0
0
0
12 ft.
MAX. HORIZONTAL
FIGURE A
SUPPORT STRAP ON
90° BEND
FIGURE B
33
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