Majestic DVDNV series Operating Instructions Manual page 19

VENTING INSTaLLaTIoN
hoRIZoNTaL TERMINaTIoN CoNFIGuRaTIoN
•
If a 90° elbow is used in the horizontal vent run, the hori-
zontal vent length is reduced by 36" (914 mm). Figure
26. This does not apply if the 90° elbows are used to
increase or redirect a vertical rise. Figure 26
Example: According to the vent graph, Figure 23, the
maximum horizontal vent length in a system with a 7.5'
vertical rise is 0' (6 m) and if a 90° elbow is required in
the horizontal vent it must be reduced to 17' (5. m). Refer
to Page 17 "How to Use Vent Graph."
In Figures 27 and 28, Dimension A plus B must not be
greater than 17' (5. m).
•
For each 45° elbow installed in the horizontal run, the
length of the horizontal run MUST be reduced by 18" (45
cm). 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
70°. Figure 28
A
10'
7'6"
Example:
Total Angular Variation
FP306
Figure 27 -
Maximum Vent Run with Elbows
FP2306
max vent run elbows
53D0419
90° Elbow = 3'
A + B = 17' Maximum
Elbow 1 =
Elbow  =
Elbow 3 =
Elbow 4 =
=
FP305
Figure 26 -
Horizontal Run Reduction
B
7'
1
2
3
4
90°
45°
45°
90°
70°
1 +  + 3 + 4 = 70°
Figure 28 -
Maximum Elbow Usage
Designer Series Gas Fireplaces
90°
A
7'6"
FP2305
run reduction
1
2
3
4
FP2307
max elbows
B
FP307
19