16 NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
u Ceiling Firestop /
Spacer (SV4.5VF)
v When using Se-
cure Flex, use
Firestop / Spac-
er SF4.5VF
A Vent Restrictor,
as shown in Figure
16 Page 12, must
be used in this
application
Figure 25 - Top Vent - STRAIGHT
40 feet
(12.2 meters)
Maximum

VERTICAL VENT FIGURES/TABLES

Notes:

• Secure Vent™ (rigid vent pipe) is shown
in the Figures; Secure Flex™ (exible vent
pipe) may also be used.
• 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 replace of 1/4" rise per foot (20 mm
per meter) which is ideal, though rise per
foot run ratios that are smaller are accept-
able all the way down to at or near level.
• SV4.5VF (Secure Vent), SF4.5VF (Secure
Flex) firestop/spacer must be used anytime
vent pipe passes through a combustible
floor or ceiling. SV4.5HF (Secure Vent),
SF4.5HF (Secure Flex)firestop/spacer must
be used anytime vent pipe passes through
a combustible wall.
• 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.
• AN ELBOW IS ACCEPTABLE AS 1 FOOT OF
VERTICAL RISE.
WARNING

Under no circumstances, may sepa-

rate sections of concentric flexible

vent pipe be joined together.

Note: Install a second
restrictor in any run
having more than 8 ft.
of vertical rise.
u When using Secure Flex, use Firestop /
Spacer SF4.5VF.
v When using Secure Flex, use Firestop /
Spacer SF4.5HF.
H
V
V1
AELBAT
VM MUMINI HmumixaM
teef)sretem(teef)sretem(
2)106.0(5 )425.1(
3)419.0(01)1.3(
4)22.1(51)56.4(
5)425.1(02)2.6(
V+V
1
.xaM)m4.21(teef04=H+
H.xaM)m2.6(teef02=
u Ceiling Firestop /
Spacer (SV4.5VF)
vWall Firestop/
Spacer (SV4.5HF)
Figure 26 - Top Vent - TWO 90 DEGREE ELBOWS
Example: If 20 feet of (H) horizontal vent run
is needed, then 4 feet minimum of (V) vertical
vent will be required.
This table shows a 1(V) to 5(H) ratio. For
every 1 foot of (V) vertical, you are allowed 5
feet of (H) horizontal run, up to a maximum
horizontal run of 20 feet.
An elbow is acceptable as 1 foot of vertical
rise.
Note: Install a second restrictor in any run
having more than 8 ft. of vertical rise.