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74D0009
VERTICAL/HORIZONTAL TERMINATION
CONFIGURATIONS
(continued)
• If a 90° elbow is used in the horizontal vent run
(level height maintained) the horizontal vent length
is reduced by 36". Refer to
Figures 16 and 17,
page
19
.
This does not apply if the 90° elbows are used to
increase or redirect a vertical rise.
Figure 19
Example: According to the vent graph (page 16) the
maximum horizontal vent length in a system with a 10'
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).
In
Figures 18 and 19
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°.
Figure 20
Figure 19 - Maximum Vent Run with Elbows
Example:
Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total Angular Variation = 270°
Figure 18 - Horizontal Run Reduction
Figure 20 - Maximum Elbow Usage
VENT INSTALLATION
90°
A + B = 17' Maximum
90° Elbow = 3'
1 + 2 + 3 + 4 = 270°
1
3
4
10'
A
B
10'
10'
7'
A
B
12" Min.
Summary of Contents for Direct Vent BLDV400
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