Majestic fireplaces DVBR36 Homeowner's Installation And Operating Manual page 17

3 x 90°
Elbows
FP1176
Fig. 26 Maximum three (3) 90° elbows per installation.
36"
(914mm)
Max.
Fig. 27 Maximum horizontal runwith 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
Max 20"
not apply if the 90° elbows are used to increase or
redirect a vertical rise. (Fig. 26)
Example: According to the vent graph (Page 15) the
maximum horizontal vent length in a system with a
7¹⁄₂" (191mm) rise is 20" (508mm) and if a 90° elbow is
required in the horizontal vent it must be reduced to 17'
(5.2m).
90 o
A
Fig. 28 Horizontal run reduction.
20000584
3 x 90°
Elbows
36"
(914mm)
Max.
B
Max 20"
A + B = 17' (Max.)
7'6"
DVBR Series Direct Vent Gas Fireplace
8'
(244cm)
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 be
installed in either the vertical or horizontal run.
FP1177
•
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 system
is 270°. (Fig. 30)
Example:
Total angular variation =
1
2
3
4
FP1178
Fig. 30 Maximum elbow usage.
A
10'
(254cm)
A + B = 17' Max.
V584-201
Horizontal Run
2/99 djt
Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
270°
1 + 2 + 3 + 4 = 270°
1
2
3
4
7'
(178cm)
B
V584-201
FP1180
17