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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
V
H
H
1
V
1
Wall Firestop/Spacer
(SV4.5HF)
Ceiling
Firestop/Spacer
(SV4.5VF)
When using Secure Flex
TM,
use Firestop/Spacer
SF4.5VF.
When using Secure
Flex, use Firestop/Spacer
SF4.5HF.
Wall Firestop/Spacer
(SV4.5HF)
v
v
u
Min. One Foot Vent
Section Required
v
u
ELBATE
muminiMVmumixaMH
teef)m(teef)m(
*)106.0(4/13)199.0(
3)419.0(7)431.2(
4)22.1(2/101)2.3(
5)425.1(41)762.4(
6)927.1(2/171)33.5(
7)431.2(02)2.6(
.xaM)m4.21(teef04=H+V
.xaM)m2.6(teef02=H
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.
Note: Install a second restrictor in any run
having more than 8 ft. of vertical rise.
See Table 9 on Page 20 as an aid in venting component selection
for a particular range of exterior wall thicknesses.
Figure 33 - Top Vent - THREE 90 DEGREE ELBOWS
HORIZONTAL VENT FIGURES / TABLES (CONTINUED)
Typical termination shown.