Vertical Through-The-Roof Applications - Monessen Hearth BDV300 Instruction Manual

BDV Series Direct Vent Gas Fireplace
Foundation
Recess
Watertight Seal
Around Pipe
Figure 27 -
Snorkel Installation, Recessed Foundation
FP1966
snorkel
• Do not back fill around snorkel.
• A clearance of at least 4" must be
maintained between the snorkel and the
soil.
VeRtIcAl (thRouGh-the-RooF) ApplI-
cAtIoNs
This Gas Fireplace has been approved for,
•
Vertical installations up to 40' (1 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 7Z\x feet or higher the
clearances 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.
•
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' (.6 m)
x45° elbows = 7' (.1 m)
0
Snorkel
Wall Screws
Sheet Metal
Screws
FP1966
40' Maximum Height
8' Minimum Height
40' Maximum Height
8' Minimum Height
Figure 28 -
Support Straps for Horizontal Runs
•
A minimum of an 8' (.5 m) vertical rise is required.
•
Two sets of 45°elbows offsets may be used within the
vertical sections. From 0 to a maximum of 8' (.5 m) of
FP1183
vent pipe can be used between elbows. Figure 29
max height
•
The maximum angular variation allowed in the system
is 70°. Figure 29
Example: Elbow 1
Elbow 
Elbow 3
Elbow 4
Total Angular Variation
VeNtING INstAllAtIoN
10' Maximum
Support Straps
Every 3'
10' Maximum
Support Straps
Every 3'
FP1183
= 90°
= 45°
= 45°
= 90°
= 70°
54D0700
Support
Straps
Every 3'