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VERTICAL SIDEWALL INSTALLATIONS
Since it is very important that the venting system
maintain its balance between the combustion air intake
and the flue gas exhaust, certain limitations as to vent
configurations apply and must be strictly adhered to.
The graph showing the relationship between vertical and
horizontal side wall venting will help to determine the
various lengths allowable. Fig. 11a or 11b.
Minimum clearance between vent pipes
and combustible materials is one (1")
inch (25mm) on top, bottom and sides
unless otherwise noted.
When vent termination exits through
foundations less than 20" below siding
outcrop, the vent pipe must flush up with
the siding. A 7DVSS must also be used.
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.
Fig. 11
20 FT
(610cm)
7.5FT (2286m)
PIPE STRAPS
EVERY 3'
(92cm)
PIPE STRAPS
EVERY 3'
(92cm)
FIRESTOP/ZERO
CLEARANCE SLEEVE
Fig. 9
3 FT
(92cm)
x
Fig. 10
7.5 ft.
2286mm
Fig. 8
For each 45 degree elbow installed in the hori-
zontal 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
o
(See Fig. 8).
Sample: 1 - 90
o
2-45
o
3-45
o
4-90
o
Total 270
o
VERTICAL SIDEWALL APPLICATIONS
The maximum number of 90 degree elbows per side wall
installation is three (3).
For D232 the maximum horizontal run off a
minimum 12" vertical rise is 3'. (See Fig. 9)
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. 10. This does not apply if the 90 degree
elbows are used to increase or redirect a vertical
rise (Fig. 11).
Example: According to the chart the maximum horizontal
vent length is 20' and if a 90 degree elbow is required in the
horizontal vent it must be reduced to 17'.
(Fig. 10 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 (Fig. 8).
A + B = 17ft.
D232x=12"