Monessen Hearth Direct Vent Gas Fireplace BDV500 - Manual (Page 23)

54D0700 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.