Vertical Vent Tables And Figures - Lennox LSS-35CN Installation Instructions Manual
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- Homeowner's care and operation instructions manual (16 pages) ,
- Care and operation instructions manual (28 pages)
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VERTICAL VENT FIGURES/TABLES
Note: Secure Vent (rigid vent pipe) is shown
in the figures; Secure Flex (flexible vent pipe)
may also be used.
WARNING
Under no circumstances may
separate sections of concentric
flexible vent pipe be joined
together.
Note: It is very important that the horizontal/
inclined run be maintained in a straight (no
dips) and recommended to be in a slightly
elevated plane, in a direction away from the
fireplace of 1/4" rise per foot (20 mm per meter)
which is ideal, though rise per foot run ratios
that are smaller are acceptable all the way down
to at or near level.
Note: SV4.5VF (Secure Vent), SF4.5VF (Secure
Flex) firestop/spacer must be used anytime vent
pipe passes through a combustible floor or ceil-
ing. SV4.5HF (Secure Vent), SF4.5HF (Secure
Flex)firestop/spacer must be used anytime vent
pipe passes through a combustible wall.
Note: Two 45 degree elbows may be used in
place of one 90 degree elbow. The same rise
to run ratios, as shown in the venting figures
for 90 elbows, must be followed if 45 degree
elbows are used.
60 feet (18.3 meters)
*Ceiling
Maximum
Firestop/Spacer
(SV4.5VF)
Figure 28
- Top Vent - STRAIGHT
H
*Ceiling
Firestop/Spacer
(SV4.5VF)
V1
**Wall
Firestop/Spacer
(SV4.5HF)
Figure 29
- Top Vent - TWO 90 DEGREE ELBOWS
*Ceiling
Firestop/Spacer
V 1
(SV4.5VF)
H
H 1
Figure 30 - Top Vent - THREE ELBOWS
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
T
A
V M
I
I N
M
U
M
e f
t e
(
m
t e
r e
) s
1 *
(
. 0
0 3
) 5
2
(
. 0
1 6
) 0
3
(
. 0
1 9
) 4
4
1 (
2 .
) 2
V
+
V
+
H
=
0 6
1
H
=
0 2
e f
*When developing chimney systems
with horizontal runs (H) that end with
V
a vertical run (V1), it is allowable to
use an elbow attached directly to the
top collar. Count the elbow attached
to the collar as 1 foot of (V) run.
V M
I
I N
**Wall
Firestop/Spacer
e f
t e
(SV4.5HF)
1
(
. 0
2
(
. 0
3
(
. 0
4
1 (
H
+
H
=
1
V
+
V
V
(
B
E L
A
H
M
a
i x
m
u
m
e f
t e
(
m
t e
r e
) s
5
1 (
5 .
) 2
0 1
(
. 3
) 1
5 1
4 (
6 .
) 5
0 2
(
. 6
) 2
f
e e
( t
8 1
3 .
m
)
M
a
. x
t e
6 (
2 .
m
)
M
a
. x
T
A
B
E L
B
H H
+
1
M
U
M
M
a
i x
m
u
m
(
m
)
e f
t e
(
m
)
0 3
) 5
5
1 (
5 .
) 2
1 6
) 0
0 1
(
. 3
) 1
1 9
) 4
5 1
4 (
6 .
) 5
2 .
) 2
0 2
(
. 6
) 2
0 2
e f
t e
6 (
2 .
m
)
M
a
. x
+
H
+
H
=
0 6
e f
t e
1
1
8 1
3 .
m
)
M
a
. x
17
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