24 53D0419
• If a 90° elbow is used in the hor-
izontal vent run, the horizontal
vent length is reduced by 36"
(914 mm). See Figure 28. This
does not apply if the 90° elbows
are used to increase or redirect
a vertical rise. See Figure 29.
Example: According to the vent
graph, Figure 27, the maximum
horizontal vent length in a
system with a 7.5' vertical rise
is 20’ (6m) and if a 90° elbow is
required in the horizontal vent it
must be reduced to 17' (5.2 m).
See page 22 “How to Use Vent
Graph.”
In Figures 28 and 29, Dimension A
plus B must not be greater than 17'
(5.2m).
• The maximum number of 45°
elbows permitted per side wall
installation is two (2). These
elbows can be installed in either the vertical or horizontal run.
• For each 45° elbow installed in the horizontal run, the length of the horizontal run
MUST be reduced by 18" (45cm). This does not apply if the 45° elbows are installed
on the vertical part of the vent system.
• The maximum number of elbow degrees in a system is 270°. See Figure 30.
Figure 29 - Maximum Vent Run with Elbows
Example: Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total Angular Variation = 270°
Figure 30 - Maximum Elbow Usage
VENT INSTALLATION
A + B = 17' Maximum
90° Elbow = 3'
1 + 2 + 3 + 4 = 270°
1
2
3
4
1
2
3
4
Figure 28 - Horizontal Run Reduction
90°
7'6"
A
B
Figure 27 - Rear Wall
Venting Graph
Horizontal Dimension From the
Outside Face of the Wall to the
Center of the Fireplace Vent
Flange
HORIZONTAL TERMINATION CONFIGURATION (Continued)
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