Monessen Hearth 624DV(ST - Manual (Page 20)

20 42D0200
Designer Series Gas Fireplaces
• If a 90° elbow is used in the horizontal vent run, the horizontal
vent length is reduced by 36" (914 mm). Figure 25. This does
not apply if the 90° elbows are used to increase or redirect a
vertical rise. Figure 25
Example: According to the vent graph, Figure 22, the maximum
horizontal vent length in a system with a 7.5' 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). Refer to Page 17 “How to Use Vent
Graph.”
In Figures 26 and 27, 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 27
vENTING INSTaLLaTIoN
hoRIZoNTaL TERMINaTIoN CoNFIGuRaTIoN (Continued)
7’6”
A B
90°
FP2305
run reduction
Figure 25 -
Horizontal Run Reduction
FP2305
A
10’
B
7’
7’6”
FP2306
max vent run elbows
Figure 26 -
Maximum Vent Run with Elbows
Example: Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total Angular Variation = 270°
A + B = 17' Maximum
90° Elbow = 3'
FP2306
Figure 27 -
Maximum Elbow Usage
1 + 2 + 3 + 4 = 270°
1
2
3
4
1
2
3
4
FP2307
max elbows
FP2307