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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
17
H
V
V1
Figure 24 - Top Vent - STRAIGHT
VERTICAL VENT FIGURES/TABLES
Notes:
pipe) may also be used.
-
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.
VERTICAL RISE EXCEPT WHERE AN ELBOW
IS THE ONLY VERTICAL COMPONENT IN
THE SYSTEM (See Figure 30).
Table A
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.
40 feet
(12.2 meters)
Maximum
u
When using Secure Flex, use Firestop / Spacer
SF4.5VF
u Ceiling Firestop /
Spacer (SV4.5VF)
u Ceiling Firestop /
Spacer (SV4.5VF)
vWall Firestop/
Spacer (SV4.5HF)
u When using Secure Flex, use Firestop /
Spacer SF4.5VF.
v When using Secure Flex, use Firestop /
Spacer SF4.5HF.
V
H
1
H
V
1
u
Ceiling
Firestop / Spacer
(SV4.5VF)
v
Wall Firestop/
Spacer (SV4.5HF)
Example: If 20 feet total (H+H
1
) 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+H
1
) horizontal run up to a maxi-
mum total horizontal run of 20 feet.
An elbow is acceptable as 1 foot of verti-
cal rise except where an elbow is the only
vertical component in the system (see
Figure 30).
Table B
H +
H
1
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)
H + H
1
= 20 feet (6.096 m) Max.
V + V
1
+ H + H
1
= 40 feet (12.192 m) Max.
u When using Secure Flex, use
Firestop / Spacer SF4.5VF
v When using Secure Flex, use
Firestop / Spacer SF4.5HF
Figure 25 - 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 except where an elbow is the only vertical
component in the system (see Figure 30).
Figure 26- Top Vent - THREE ELBOWS
WARNING
Under No Circumstances, May Sepa-
rate Sections of Concentric Flexible
Vent Pipe Be Joined Together.