Designer Series Gas Fireplaces | ventING installation |
horizontal termination configuration (Continued)
•If a 90° elbow is used in the horizontal vent run, the horizontal vent length is reduced by 36" (914 mm). Figure 25. This does not apply if the 90° elbows are used to increase or redirect a vertical rise. Figure 25
Example: According to the vent graph, Figure 22, the maximum horizontal vent length in a system with a 7.5' vertical rise is 20’ (6 m) and if a 90° elbow is required in the horizontal vent it must be reduced to 17' (5.2 m). Refer to Page 17 “How to Use Vent Graph.”
In Figures 26 and 27, Dimension A plus B must not be greater than 17' (5.2 m).
•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" (45 cm). 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 27
A
FP2305
90°
B
7’6”
Figure 25 -
Horizontal Run Reduction
A | B | |
7’ | ||
10’ | ||
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| 90° Elbow = 3' |
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| A + B = 17' Maximum |
| 1 | ||
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| 2 |
7’6” | Example: | Elbow 1 | = | 90° | 3 |
| 4 | ||||
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| Elbow 2 | = | 45° | |
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| Elbow 3 | = | 45° |
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| Elbow 4 | = | 90° |
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| Total Angular Variation | = | 270° |
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| FP2306 |
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| Figure 26 - |
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| Maximum Vent Run with Elbows |
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| 1 + 2 + 3 + 4 = 270° |
1 
2
3
4
Figure 27 - | FP2307 |
Maximum Elbow Usage |
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20 | 42D0200 |
