Majestic 33LDVT Installation Instructions And Homeowner's Manual page 15

Pipe Straps
Every 3' (914mm)
Fig. 16 Support straps for horizontal runs.
FP1012
Horizontal plane means no vertical rise exists on this
Top vent max run
portion of the vent assembly.
1/25/00 djt
•
The maximum number of 90° elbows per side wall
installations is three (3).
•
If a 90° elbow is fitted directly onto the fireplace
flange the maximum horizontal vent run before the
termination or a vertical rise is 36" (914 mm).
•
If a 90° elbow is used in the horizontal vent run
(level height maintained) the maximum horizontal
vent length is reduced by 36" (914 mm). This does
not apply if the 90° elbows are used to increase or
redirect a vertical rise.
Example: According to the chart the maximum
horizontal vent length in a system with a 7.5' (2.3 m)
vertical rise is 20' (6 m) and if a 90° is required in
the horizontal vent it must be reduced to 17' (5.2 m).
In Figure 18, Dimension A plus B must not be
greater than 17' (5.2 m).
Fig. 17 Maximum horizontal vent run.
FP1237
horizontal plane
12/02
10007852
20' (6m)
Pipe
Straps Every
3' (914mm)
Firestop/Zero
Clearance Sleeve
3'
(914mm)
LDVT Series Direct Vent GaS Fireplace
FP1012
Fig. 18 Maximum vent run with elbows.
•
The maximum number of 45° elbows permitted per
installation 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.
•
The maximum number of elbow degrees in a system
is 270°. (Fig. 19)
Example:
Total angular variation = 270°
FP1237
Fig. 19 Maximum number of elbow degrees.
1 x 90° elbow in horizontal plane = 3' (914mm)
Elbow 1 = 90°
Elbow 2 = 45°
4
Elbow 3 = 45°
Elbow 4 = 90°
1 + 2 + 3 + 4 = 270°
3
2
1
FP1238
FP1239
15