Monessen Hearth SDV Series Installation And Operating Instructions Manual page 25

VERTICAL THROUGH-THE-ROOF APPLICATIONS (continued)
This Gas Fireplace has been approved for,
• Vertical installations up to 40' (12m) in height. Up to a 10' (3m)
horizontal vent run can be installed within the vent system
using a maximum of two 90° elbows. See Figure 31.
40' Maximum Height
8' Minimum Height
• Up to two 45° elbows may be used within the
horizontal run. For each 45° elbow used on the
horizontal plane, the maximum horizontal length
must be reduced by 18" (450mm).
Example: Maximum horizontal length
No elbows = 10' (3m)
1x45° elbows = 8.5' (2.6m)
2x45° elbows = 7' (2.1m)
• A minimum of an 8' (2.5m) vertical rise is
required.
• Two sets of 45°elbows offsets may be used within
the vertical sections. From 0 to a maximum of 8'
(2.5 m) of vent pipe can be used between elbows.
See Figure 32.
• Determine the roof pitch and use the appropriate
starter kit for offset installation.
• The maximum angular variation allowed in the
system is 270°. See Figure 32.
• The minimum height of the vent above the high-
est point of penetration through the roof is 1'
(305mm).
56D2161
10'
Maximum
Support Straps
Every 3'
Figure 31 - Support Straps for Horizontal Runs
40' Maximum Height
8' Minimum Height
1
2
3
4
Example: Elbow 1 =
Elbow 2 =
Elbow 3 =
Elbow 4 =
Total Angular Variation =
Figure 32 - Maximum elbow Usage
VENT INSTALLATION
10'
Maximum
Support Straps
Every 3'
1
2
90°
45°
3
45°
4
90°
270°
Support
Straps
Every
5'Vertical
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