Monessen Hearth KHLDV400 - Manual (Page 16)

16 73D0024
KHLDV Series Gas Fireplace VentInG InStaLLatIOn
VertIcaL/HOrIZOntaL terMInatIOn
cOnFIGuratIOnS
(continued)
• If a 90° elbow is used in the horizontal vent run (level
height maintained) the horizontal vent length is reduced
by 36". Refer to Page 17, Figures 11 and 12. This does
not apply if the 90° elbows are used to increase or
redirect a vertical rise. Figure 14
example: According to the vent graph (Page 16) the
maximum horizontal vent length in a system with a 10'
vertical 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 13 and 14 dimension A plus B must not be
greater than 17' (5.2 m).
• 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" (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
270°. Figure 15
A 10’
B 7’
10’
FP1959
max vent run w/elbows
Figure 14 -
Maximum Vent Run with Elbows
A + B = 17' Maximum
90° Elbow = 3'
FP1959
Example: Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total Angular Variation = 270°
Figure 15 -
Maximum Elbow Usage
1
2
3
4
1
2
3
4
FP1180
max bends
24" Minimum
FP1180
A B
10’
90°
FP2133
Horizontal run
reduction
Figure 13 -
Horizontal Run Reduction
FP2133