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<;ince it is very important that the venting system maintain its
,Janee between the combustion air intake and the flue gas
1ust, certain limitations as to vent configurations apply and
, .. ~st be strictly adhered to.
The graph, on page 11, showing the relationship
between vertical and horizontal side wall venting will
help to determine the various lengths allowable.
Minimum clearance between vent pipes and com-
bustible materials is one 1 "(25mm) on top, bottom
and sides unless othenvise noted.
When vent termination exits through foundations
less than 20" below siding outcrop, the vent pipe
must flush up with the siding.
It is always best to locate the fireplace 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 flue collar of the fireplace to the
face of the outer wall.
Horizontal plane means no vertical rise exists on
this portion of the vent assembly.
.
.
VERTICAL SIDEWALL APPLICATIONS
•
The maximum number of90 degree elbows per side wall
installation is three (3).
•
For RFSDV34 models the maximum horizontal run off a
minimum 12" vertical rise is 3'. (See Fig. 15)
If a 90 degree elbow is used in the horizontal vent run
(level height maintained) the maximum horizontal vent
length is reduced by 36 inches, (Fig. 14). This does not
apply if the 90 degree elbows are used to increase or
redirect a vertical rise (Fig.
I
6).
Example: According to the chart the maximum horizon-
tal vent length is 20' and if a 90 degree elbow is required
in the horizontal vent it must be reduced to 17'.
In Fig. 14 Dimension A plus B must not be greater
than 17'.
•
The maximum number of 45 degree elbows permitted
per side wall installation is two (2). These elbows can be
installed in either the vertical or horizontal run.
For each 45 degree elbow installed in the horizontal run,
the length of the horizontal run MUST be reduced by
18" (45cm). This does not apply if the 45 degree elbows
are installed on the vertical part of the vent system.
The maximum number of elbow degrees in a system is
270" (See Fig. 13).
Example: In Figure 13
l
2
3
4
Total
7.5 ft.
2286mm
X
0
i
G)
©
3FT
(92cm)
PIPE STRAPS
EVEltYl'
(9lcrn)
!0001948/1 -Page 10 -
90°
45°
45°
90°
270'
A+ B = 17ft.
Fig. 13
Fig. 14
RFSDV34
t
PIPE STltAPS
EVERY3'
(9km)
Fig. 15
Fig. 16
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Troubleshooting
