Monessen Hearth LEXINGTON LX32DV - Manual (Page 19)

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LX Series Direct Vent Gas Fireplace VeNtING INStALLAtIoN
FP1176
max 90 bends
Figure 20 -
Maximum Three (3) 90° Elbows
Per Installation
3 x 90°
Elbows
3 x 90°
Elbows
FP1176
Max 20"
Max 20"
36"
(914 mm)
Max.
36"
(914 mm)
Max.
FP1177
max horizontal run
Figure 21 -
Maximum Horizontal Run with No Rise
FP1177
example: According to the vent graph (Page 16) the
maximum horizontal vent length in a system with a 7.5'
vertical rise is 20’ (6 m). If a 90° elbow is required in the
horizontal vent it must be reduced to 17' (5.2 m).
In Figures 22 and 23, 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"
(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°. Figure 24
A: 10’
B: 7’
7’6”
FP1959
max run w/elbows
Figure 22 -
Maximum Vent Run with Elbows
Horizontal 90° Elbow = 3' Reduction
FP1959
A + B = 17' Maximum
90°
A B
7’6”
(2.3 m)
FP2717
horiz run reduct
Figure 23 -
Horizontal Run Reduction
FP2717
example: Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total Angular Variation = 270°
Figure 24 -
Maximum Elbow Usage
1
2
3
4
1
2
3
4
1 + 2 + 3 + 4 = 270°