DVRT41 Direct Vent Gas Fireplace
•The maximum number of 90° elbows per side wall installation is three (3). (Fig. 2)
•If a 90° elbow is fitted directly on top of the fireplace flange the maximum horizontal vent run before the termination or a vertical rise is 36” (914mm). (Fig. 27)
|
| 7' |
A | 10' | (178 cm) B |
| (254 cm) |
|
|
| A + B = 17’ |
8' |
| (518cm) Max. |
3 x 90°
Elbows 
3 x 90° |
Elbows |
FP1176 |
(244 cm)
Fig. 29 Maximum vent run with elbows.
In Figure 28 & 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 |
Fig. 26 | Maximum three (3) 90° elbows per installation. |
| 36" |
| (914mm) |
| Max. |
| 36" |
| (914mm) |
| Max. |
| FP1177 |
Fig. 27 | Maximum horizontal run with no rise. |
•If a 90° elbow is used in the horizontal vent run (level height maintained) the horizontal vent length is reduced by 36” (914mm). (Fig. 28 & 29) This does not apply if the 90° elbows are used to increase or redirect a vertical rise. (Fig. 26)
Example: According to the vent graph (Page 13) the maximum horizontal vent length in a system with a 7¹⁄₂’ (2.3m) rise is 20’ (6m) and if a 90° elbow is required in the horizontal vent it must be reduced to 17’ (5.2m).
AB
A + B = 17’ (Max.)
(5.2m)
7’6"
(2.3m)
FP1178
Fig. 28 Horizontal run reduction.
16
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” (457mm). 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 sys- |
tem is 270°. (Fig. 30) Example:
| Elbow 1 | = | 90° |
| Elbow 2 | = | 45° |
| Elbow 3 | = | 45° |
| Elbow 4 | = | 90° |
Total angular variation | = | 270° | |
| 1 + 2 + 3 + 4 = 270° | ||
1 |
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| 1 |
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2 |
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| 2 |
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3 |
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| 3 |
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4 |
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| 4 |
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| FP1180 |
Fig. 30 | Maximum elbow usage. |
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| 10006740 |
