10
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, certain lim-
itations 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 vent run with the 90 degree bend to the fire-
place flue outlet is 3 feet (91cm) Figure 1. The maximum horizontal
vent run is 10 feet (305cm) when the vertical rise is 8 feet (244cm)
Figure 2. Note: 1/4” vertical rise is required for every 12” of horizontal
run.
The maximum number of 90 degree bends per side wall installation is
one (1).
The maximum number of 45 degree bends per side wall installation is
two (2). These bends can be installed in either the horizontal or vertical
run.
Maximum vertical rise is 20 feet (6.09 meters).
Special Note: For each 45 degree bend installed in the horizontal
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.
How To Use The Vent Table
1. Determine the height of the system and the number of bends
required.
2. Having determined the vertical distance determine the maximum
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.
Venting Table For Top Vent Models
for venting to a maximum of 20 ft. (6.09meters)
Sidewall or Vertical Venting (See Fig. A & B)
Total Vertical
Max Total Horizontal
Feet
Meters
Feet Meters
4
1.2
3
0.9
5
1.5
4
1.2
6
1.8
6
1.8
7
2.1
8
2.4
8
2.4
10
3.0
9
2.7
11
3.4
10
3.0
12
3.7
11
3.4
13
4.0
12
3.7
14
4.3
13
4.0
15
4.6
14
4.3
16
4.9
15
4.6
15
4.6
16
4.9
14
4.3
17
5.2
13
4.0
18
5.5
12
3.7
19
5.8
11
3.4
20
6.1
10
3.0
Example A:
If the vertical dimension from
the floor of the fireplace is
6.5ft, the horizontal run to the
wall flange of the vent termi-
nation must not exceed 7.5ft.
NOTE: The final location of
the fireplace must be such
that the horizontal vent
dimensions fall within those
stated on the graph. The
Maximum Vertical vent run is
20 feet (6.09meters).
Important:
Always locate the fireplace in such a way that a minimum of off-
sets and/or horizontal runs are required. 1/4” vertical rise is required for every
12” horizontal run.
Important:
Minimum clear-
ance between vent pipes and
combustible materials is 1 inch
(25mm).
7.5
6.5
