HBDV7 Series Direct Vent Gas Fireplace | VENTING INSTALLATION |
When installing the appliance as a rear vent unit, the 90° or 45° Transition Elbow attached directly to the rear of the unit is NOT INCLUDED in the following cri- teria and calculations, and unless specifically men- tioned should be ignored when calculating venting layouts.
• The maximum number of 90° elbows per side wall in- |
stallation is three (3). Figure 23 |
•The maximum number of elbow degrees in a system is 270°. Figure 27
Example: | Elbow 1 | = 90° | |
|
| Elbow 2 | = 45° |
|
| Elbow 3 | = 45° |
|
| Elbow 4 | = 90° |
Total angular variation | = 270° | ||
• If a 90° elbow is fitted directly on top of the fireplace |
flange the maximum horizontal vent run before the ter- |
mination or a vertical rise is 36” (914 mm). Figure 24 |
• If a 90° elbow is used in the horizontal vent run (level |
height maintained) the horizontal vent length is re- |
duced by 36” (914 mm). Figures 24 & 25. This does |
not apply if the 90° elbows are used to increase or |
redirect a vertical rise. Figure 23 |
3 x 90° | 3 x 90° |
Elbows | Elbows |
Figure 23 - | FP1176 |
Figure 25 -
Horizontal Run
Reduction
AB
A + B = 17' (Max.)
(5.2m)
7'6"
(2.3m)
FP1177
B
7’
(2.1 m)
Maximum three (3) 90° elbows per installation |
36" | 36" | |
(914 mm) | ||
(914 mm) | ||
Max. | ||
Max. | ||
|
FP1177
Figure 24 -
Maximum horizontal run with no rise
Example: According to the vent graph (Page 14) the maximum horizontal vent length in a system with a 7Z\x’ (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).
In Figures 26 & 27, dimension A plus B must not be great- er than 17’ (5.2 m)
•The maximum number of 45° elbows permitted per in- stallation is six (6). 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.
A 10’ (3 m)
7’6"
(2.3 m)
Figure 26 -
Maximum Vent Run with Elbows
| |
1+ 2 + 3 + 4 = 270° |
|
1 | 1 |
| |
2 | 2 |
| |
3 | 3 |
| |
4 | 4 |
|
Figure 27 - | FP1180 |
| |
Maximum Elbow Usage |
|
18 | 54D8000 |