NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
21
V
H
H 1
�
Wall Firestop/Spacer
(SV4.5HF)
�
Wall Firestop/Spacer
(SV4.5HF)
�
When using Secure Flex,
use Firestop/Spacer
SF4.5HF.
�
Ceiling
Firestop/Spacer
(SV4.5VF)
�
Note - When using
Secure Flex
TM
, use
Firestop/Spacer SF4.5VF.
Table E
H
+ H
1
Maximum
V Minimum
feet
(meter)
feet
(meter)
3
(0.914)
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 +
H
+ H
1
= 40 feet (12.2 m) Max.
H
+ H
1
= 20 feet (6.096 m) Max.
Figure 32
-
Top Vent - TWO 90 DEGREE ELBOWS
Square termination (SV4.5HT-2) shown.
See Table 8 on Page 20 as an aid in venting
component selection for a particular range of
exterior wall thicknesses.
HORIZONTAL VENT FIGURES / TABLES (CONTINUED)
Example:
If 20 feet of (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 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
.
V
H
H 1
V 1
�
Wall Firestop/Spacer
(SV4.5HF)
�
Ceiling
Firestop/Spacer
(SV4.5VF)
�
When using Secure Flex,
use Firestop/Spacer
SF4.5VF.
�
When using Secure
Flex, use Firestop/Spacer
SF4.5HF.
�
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 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 33
-
Top Vent - THREE 90 DEGREE ELBOWS
See Table 8 on Page
20 as an aid in venting
component selection for
a particular range of exte-
rior wall thicknesses.
Table F
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.
Square termination
(SV4.5HT-2) shown.
f i r e - p a r t s . c o m
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