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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
18
H
V
V1
V
H
Figure 29 - Side Vent - ONE 90 DEGREE ELBOW
Figure 30 - Top Vent - TWO 90 DEGREE ELBOWS
u
Ceiling Firestop /
Spacer (SV4.5VF)
v
Wall Firestop/
Spacer (SV4.5HF)
u Ceiling Firestop / Spacer (SV4.5VF)
u When using Secure Flex, use
Firestop / Spacer SF4.5VF.
v When using Secure Flex, use
Firestop / Spacer SF4.5HF.
Example: If 20 feet of (H) hori-
zontal 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) verti-
cal, 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 except where
an elbow is the only vertical
component in the system. See
Figure 37.
Table B
H Maximum
V Minimum
feet (meter) feet (meter)
5 (1.524) Elbow Only
5 (1.524) 1 (0.305)
10 (3.048) 2 (0.610)
15 (4.572) 3 (0.914)
20 (6.096) 4 (1.219)
V + V
1
+ H = 40 feet (12.2 m) Max.
H = 20 feet (6.096 meters) Max.
Table A
H Maximum
V Minimum
feet (meter) feet (meter)
2 (0.610) 1 (0.305)
4 (1.219) 2 (0.610)
6 (1.829) 3 (0.914)
8 (2.438) 4 (1.219)
V + H = 40 feet (12.2 meters) Max.
H = 8 feet (2.4 meters) Max.
Ratio V to H ratio is 1:2
u When using Secure Flex, use Firestop /
Spacer SF4.5VF.
Example: If 8 feet of (H) horizontal vent run is needed, then 4 feet minimum (V) vertical vent will be
required.
This table shows a 1(V) to 2(H) ratio. For every 1 foot of (V) vertical, you are allowed 2 feet of (H)
horizontal run, up to a maximum horizontal run of 8 feet.
VERTICAL VENT FIGURES/TABLES
Notes:
• Secure Vent™ (rigid vent pipe) is shown
in the Figures; Secure Flex™ (flexible vent
pipe) may also be used.
• Itisveryimportantthatthehorizontal/in-
clined 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.
• 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.
• ANELBOWISACCEPTABLEAS1FOOTOF
VERTICAL RISE EXCEPT WHERE AN ELBOW
IS THE ONLY VERTICAL COMPONENT IN
THE SYSTEM (See Figure 37).
WARNING
Under no circumstances, may sepa-
rate sections of concentric flexible
vent pipe be joined together.
Figure 28 - Top Vent - STRAIGHT
A Vent Restrictor, as
shown in Figure 16,
Page 13, must be used
in this application
uCeiling Firestop /
Spacer (SV4.5VF)
u
When using Secure Flex, use Firestop / Spacer
SF4.5VF
40 feet
(12.2 meters)
Maximum