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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 CONCEN-
TRIC 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
" 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: SV4.5BF (Secure Vent), SF4.5BF (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.
40 feet (12.2 meters)
*Ceiling
Firestop/Spacer
(SV4.5BF)
Figure 23
- Top Vent - STRAIGHT
12
V M
e f
t e
1
2
3
4
V
+
Figure 24
V1
Maximum
Figure 25
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
T
A
B
E L
A
H
M
a
i x
m
u
m
I
I N
M
U
M
(
m
)
e f
t e
(
m
)
(
. 0
0 3
) 5
2
0 (
6 .
) 1
0 (
6 .
) 1
4
(
. 1
2 2
) 2
(
. 0
1 9
) 4
6
1 (
8 .
) 6
1 (
2 .
) 2
8
(
. 2
) 4
H
=
0 4
f
e e
( t
2 1
4 .
m
)
M
a
. x
H
=
8
e f
t e
2 (
4 .
m
)
M
a
. x
- Rear Vent - ONE 90 DEGREE ELBOW
H
*Ceiling
Firestop/Spacer
(SV4.5BF)
**Wall
Firestop/Spacer
(SV4.5HF)
*Ceiling
Firestop/Spacer
(SV4.5BF)
- Top Vent - TWO 90 DEGREE ELBOWS
*Ceiling
Firestop/Spacer
(SV4.5BF)
**Wall
Firestop/Spacer
(SV4.5HF)
V
H
T
A
V M
I
I N
M
U
M
e f
t e
(
m
t e
r e
1
(
. 0
0 3
) 5
2
(
. 0
1 6
) 0
3
(
. 0
1 9
) 4
4
1 (
2 .
) 2
V
+
V
+
H
=
1
H
=
0 2
e f
V
B
E L
B
H
M
a
i x
m
u
m
) s
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
0 4
f
e e
( t
2 1
4 .
m
)
M
a
. x
t e
6 (
2 .
m
)
M
a
. x
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