| 3 x 90° | 3 x 90° |
| Elbows | Elbows |
|
| FP1176 |
Fig. 27 | Maximum three (3) 90° elbows per installation. | |
|
| 36" |
|
| (914mm) |
|
| Max. |
|
| 36" |
|
| (914mm) |
|
| Max. |
FP1177
Fig. 28 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” (914 mm). (Fig. 29, 30) This does not apply if the 90° elbows are used to increase or redirect a vertical rise. (Fig. 27)
Example: According to the vent graph (Page 14) the maximum horizontal vent length in a system with a 7¹⁄₂’ (2.3 m) 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).
A 
B
A + B = 17' (Max.)
(5.2m)
7'6"
(2.3m)
FP1178
Fig. 29 Horizontal run reduction.
20010667
DV360/580 Series Direct Vent Gas Fireplace
7’
(2.1 m)
A10’
(3 m) | B |
|
8’
(2.4 m)
Fig. 30 Maximum vent run with elbows.
In Figures 29 & 30, 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” (457 mm). 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°. (Fig. 31)
Example:
| Elbow 1 | = 90° |
|
| Elbow 2 | = 45° |
|
| Elbow 3 | = 45° |
|
| Elbow 4 | = 90° |
|
Total angular variation | = 270° |
| |
1 |
| 1 |
|
2 |
| 2 |
|
3 |
| 3 |
|
4 |
| 4 |
|
| 1 + 2 + 3 + 4 = 270° | FP1180 | |
Fig. 31 | Maximum elbow usage. |
| |
|
|
| 17 |
