Vermont Castings Lexington LX32DV Installation And Operating Instructions Manual page 18

LX Series Direct Vent Gas Fireplace
3 x 90°
Elbows
Figure 20 -
Maximum Three (3) 90° Elbows
Per Installation
36"
(914 mm)
Max.
FP1176
max 90 bends
Figure 21 -
Maximum Horizontal Run with No Rise
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).
Max 20"
•
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
18
FP1177
3 x 90°
Elbows
FP1176
36"
(914 mm)
Max.
example: Elbow 1
Max 20"
Elbow 2
Elbow 3
Elbow 4
Total Angular Variation
A: 10'
7'6"
FP1959
FP1177
FP2717
1 + 2 + 3 + 4 = 270°
FP2717
horiz run reduct
1
2
3
4
= 90°
= 45°
= 45°
= 90°
= 270°
Figure 24 -
Maximum Elbow Usage
VeNtING INStALLAtIoN
Horizontal 90° Elbow = 3' Reduction
A + B = 17' Maximum
Figure 22 -
Maximum Vent Run with Elbows
90°
A
B
FP1959
max run w/elbows
7'6"
(2.3 m)
Figure 23 -
Horizontal Run Reduction
1
2
3
4
B: 7'
51D0528