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Monessen Hearth HBDV300 User Manual

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54D5031 
23
40' Maximum Height
8' Minimum Height 
10'
Maximum 
Support Straps
Every 3'
40' Maximum Height
8' Minimum Height 
10'
Maximum 
Support Straps
Every 3'
Support 
Straps
Every 
5'Vertical
VERTICAL (THROUGH-THE-ROOF) APPLICATIONS 
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 28.
Figure 28 - Support Straps for Horizontal Runs
VENT INSTALLATION 
Figure 29 - Maximum Elbow Usage 
•   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 29.
•   The maximum angular variation allowed in the 
system is 270°. See Figure 29.
1
2
3
4
1
2
3
4
Example: 
Elbow 1   =   90°
 
Elbow 2   =   45°
 
Elbow 3   =   45°
 
Elbow 4   =   90°
Total Angular Variation  =   270°
NOTE: Horizontal sections of this vent system require a 
minimum of 3" clearances to combustibles at the top of 
the fl ue and 1" clearance at the sides and bottom until the 
fl ue penetrates the outside wall. A minimum 1" clearance all 
around the fl ue is acceptable at this point of penetration.
Vertical sections of this vent system require a minimum of 
1" clearance to combustibles on all sides of the pipe.