Monessen Hearth CDV7 - Page 21

CDVSC7 & CDV7 Series Gas Fireplace
69D3011
1
• The maximum number of 90° elbows per side wall in-
stallation is three (3). Figure 21
• If a 90° elbow is fitted directly on top of the fireplace
flange the maximum horizontal vent run before the ter-
mination or a vertical rise is 36” (914 mm). Figure 22
• If a 90° elbow is used in the horizontal vent run (level
height maintained) the horizontal vent length is re-
duced by 36” (914 mm). Figures 22 & 23. This does
not apply if the 90° elbows are used to increase or
redirect a vertical rise. Figure 21
 According to the vent graph (Page 15) the
maximum horizontal vent length in a system with a 7Z\x’
(.3 m) rise is 0’ (6 m) and if a 90° elbow is required in
the horizontal vent it must be reduced to 17’ (5. m).
In Figures 24 & 25, dimension A plus B must not be great-
er than 17’ (5.m)
• The maximum number of 45° elbows permitted per in-
stallation is six (6). 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
70°. Figure 25
Example: Elbow 1 = 90°
Elbow  = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total angular variation = 70°
3 x 90°
Elbows
3 x 90°
Elbows
FP1176
Figure 21 -
Maximum three (3) 90° elbows per installation
Max 20"
Max 20"
36"
(914mm)
Max.
36"
(914mm)
Max.
FP1177
Figure 22 -
Maximum horizontal run with no rise

7’6"
(2.3m)
A
B
A + B = 17’ (Max.)
(5.2m)
FP1178
Figure 23 -
Horizontal Run Reduction
V584-201
Horizontal Run
2/99 djt

10’
(3 m)
7’
(.1 m)
7’6"
(.3 m)
V584-01

Figure 24 -
Maximum Vent Run with Elbows
1
2
3
4
1
2
3
4

FP1180
Figure 25 -
Maximum Elbow Usage