Monessen Hearth BDV300 Installation And Operating Instructions Manual page 23

VENt INStALLAtION
VERTICAl (THROUGH-THE-ROOF) APPlICATIONS
This Gas Fireplace has been approved for,
• Vertical installations up to 40' (12 m) in height. Up to a 10' (3 m) horizontal vent run can
be installed within the vent system using a maximum of two 90° elbows. Figure 28
NOTE: Horizontal sections of this vent system require a minimum of 3" clearances to
combustibles at the top of the flue unless the vertical run is 7
for the horizontal run is 1" at the top, and 1" clearance at the sides and bottom until the flue
penetrates the outside wall. A minimum 1" clearance all around the flue 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.
40' Maximum Height
8' Minimum Height
Figure 28 - Support Straps for Horizontal Runs
• 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" (450 mm).
Example: Maximum horizontal length
No elbows = 10' (3 m)
1x45° elbows = 8.5' (2.6 m)
2x45° elbows = 7' (2.1 m)
• A minimum of an 8' (2.5 m) vertical rise is
required.
• Two sets of 45°elbows offsets may be used
within the vertical sections. From 0 to a maxi-
mum of 8' (2.5 m) of vent pipe can be used
between elbows. Figure 29
• The maximum angular variation allowed in
the system is 270°. Figure 29
54D0700
10'
Maximum
Support Straps
Every 3'
FP1183
max height
1
/ feet or higher the clearances
2
Support
Straps
Every
5'Vertical
40' Maximum Height
8' Minimum Height
1
2
3
4
Example: Elbow 1
Elbow 2
Elbow 3
Elbow 4
Total Angular Variation
Figure 29 - Maximum Elbow Usage
BDV Series Gas Fireplace
10'
Maximum
Support Straps
Every 3'
FP1183
1
2
= 90°
3
= 45°
= 45°
4
= 90°
= 270°
FP1179
max bends
FP1179
3