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VenTInG InSTallaTIon
VerTIcal/horIZonTal TerMInaTIon
conFIGuraTIonS
Since it is very important that the venting system main-
tain its balance between the combustion air intake and
the flue gas exhaust, certain limitations as to vent con-
figurations 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 9
noTe: Horizontal sections of this vent system require a
minimum of 3" clearances to combustibles at the top of the
flue 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.
When vent exits through foundations less than 20" below
outcrop, the termination must be flush up with outcropped
wall above.
It is 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 (or the top of the
Transition Elbow) to the face of the finished outside wall.
•
The maximum number of 90° elbows per side wall
installation is three (3). Figure 10
•
A minimum of 24" is required before a 90° elbow. If a 90°
elbow is fitted directly after 24" vertical section mounted
to the top of the fireplace, the maximum horizontal vent
run before the termination or a vertical rise is 36" (914
mm). Figure 11
3 x 90°
Elbows
24" Min.
Figure 10 -
Maximum Three (3) 90° Elbows Per Installation
73D4125
FP1176
(914 mm)
24"
(610 mm)
Figure 11 -
Maximum Horizontal Run with No Rise
•
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 10 and 11. This does not apply
if the 90° elbows are used to increase or redirect a verti-
cal rise. Figure 12
Example: According to the vent graph (page 16) the maxi-
mum horizontal vent length in a system with a 10' vertical
rise is 20' (6 m) and if a 90° elbow is required in the hori-
zontal vent it must be reduced to 17' (5.2 m).
Figure 12 -
Maximum Vent Run with Elbows
FP2488
In Figure 12 dimension A plus B must not be greater than
17' (5.2 m).
•
The maximum number of 45° elbows permitted per side
wall installation is two (2). These elbows can be installed
in either the vertical or horizontal run.
•
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 14
KSTDV Series Gas Fireplace
36"
Max.
FP1177
Max 20"
B
Max 20"
FP1177
max horizontal run
36"
(914 mm
Max.
15
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