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VWDV70 Series Gas Fireplace
VENTING INSTALLATION
VERTICAL/HORIZONTAL TERMINATION
CONFIGURATIONS
Since it is very important that the venting system
maintain its balance between the combustion air intake
and the fl ue gas exhaust, certain limitations as to vent
confi gurations apply and must be strictly adhered to.
The Vent Graph, showing the relationship between vertical
and horizontal side wall venting, will help to determine the
various dimensions allowable.
Figure 14
NOTE:
Horizontal and vertical sections of this vent system
require a minimum of 3" (76 mm) clearance to combustibles
on all sides.
When vent exits through foundations less than 20" below
outcrop, the termination must be
fl
ush up with outcropped
wall above.
It is best to locate the
fi
replace in such a way that minimizes
the number of offsets and horizontal vent length.
The horizontal vent run refers to the total length of vent
pipe from the
fl
ue collar of the
fi
replace (or the top of the
Transition Elbow) to the face of the
fi
nished outside wall.
•
The maximum number of 90° elbows per side wall
installation is three (3).
Figure 18
•
A minimum of 36" (914 mm) is required before a 90°
elbow.
Figure 19
Figure 18 -
Maximum Three (3) 90° Elbows Per Installation
3 x 90°
Elbows
36" (914 mm)
Min.
FP1176
In
Figures 20 and 21
dimension A plus B must not be
greater than 17' (5.2 m).
•
For each 45° elbow installed in the horizontal run, the
length of the horizontal run MUST be reduced by 18"
(457 mm). This does not apply if the 45° elbows are
installed on the vertical part of the vent system.
•
The maximum number of elbow degrees in a system is
270°.
Figure 21
Figure 19 -
Maximum Horizontal Run with No Rise
36"
(914 mm)
Max.
FP1177
•
If a 90° elbow is used in the horizontal vent run (level
height maintained) the horizontal vent length is reduced
by 36". Refer to
Figures 20 and 21.
This does not apply if
the 90° elbows are used to increase or redirect a vertical
rise.
Figure 20
Example: According to the vent graph (Page 15) the max-
imum horizontal vent length in a system with a 10' vertical
rise is 17
1
⁄
2
' (5.3 m) and if a 90° elbow is required in the
horizontal vent it must be reduced to 14
1
⁄
2
' (4.4 m).
Figure 20 -
Horizontal Run Reduction
A
B
10’
90° Elbow = 3' Reduction
10'
(3 m)
FP2934
