Venting Routes And Components
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 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 is 20ft (6.1m) when the vertical
rise is 8 ft (2.4m). See
Example A
below.
Note: 1/4” vertical rise is required for every 12” of
horizontal run.
The maximum number of 45° bends per side wall installation is
four (4) in the horizontal run. You must reduce the length of the
horizontal by 18” (45cm) for each 45° bend.
The maximum vertical run is 43ft (13.1m).
Special Note:
For each 45° 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° bends are installed on
the vertical part of the vent system.
Example:
If according to
the table, the length of the horizontal run is 10ft (3m), and two
45° bends are required, the horizontal run length must be
reduced to 8ft (2.4m).
Two (2) additional 90° bends (or the equivalent) are allowed.
The horizontal run must be reduced by 36” (90cm) for each 90°
bend, or 18” (45cm) per each 45° bend.
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. Flex pipe runs not having 90˚ bends will not fall into
vent table standards. See
Example B
below.
Horizontal Venting Table from Bottom of Fireplace
For venting to a maximum of 43ft (13.1 meters)
Total Vertical
Max Total Horizontal
Feet
Meters
Feet
Meters
(56” Min)
1.42
4
1.2
6
1.8
6
1.8
7
2.1
20
6.1
8
2.4
20
6.1
9
2.75
20
6.1
10
3.0
20
6.1
11
3.4
20
6.1
12
3.7
20
6.1
13
4.0
20
6.1
14
4.3
20
6.1
15
4.6
20
6.1
20
6.1
20
6.1
25
7.6
15
4.6
30
9.1
10
3.0
43 (Max)
13.1
0
0
43 (Max)
13.1
4
1.22
NOTE:
A length of horizontal vent run
less
than the maximum is
acceptable (such as up and out) provided that clearances to
combustibles are maintained and proper procedures are
followed.
NOTE:
The final location of the fireplace must be such that the
horizontal vent dimensions fall within those stated in the
Horizontal Venting Table. The Maximum Vertical vent run is
43ft (13.1m).
IMPORTANT:
Always locate the fireplace in such a way that a minimum of
offsets and/or horizontal runs are required. For every 12”
(30cm) horizontal run, 1/4” (6mm) vertical rise is required.
Support Straps
Every 2 Feet
20 Ft (6.1m) MAX
8 Ft (2.4m)
8Ft (2.4m)
Plus ¼” Rise/Ft
96”+ (1/4”x20)
96” + 5”
=101” (
8’ 5”)
Termination Height
Example A
Example B
IMPORTANT:
Minimum clearance between vertical vent pipes and combustible
materials is1” (25mm).
Support Strap
on 90° Bend
Example C
7Ft (2.1m)
3 – 90° Elbows =
14ft (2.3m)
Max Total Horizontal
75
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