2
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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 29
.
V
H
H
V
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.
v
Wall Firestop/Spacer
(SV4.5HF)
See Table 10 on Page 19 as
an aid in venting component
selection for a particular
range of exterior wall thick-
nesses.
Figure 32
- Top Vent - THREE 90 DEGREE ELBOWS
HORIZONTAL VENT FIGURES / TABLES (CONTINUED)
Table F
H
+ H
Maximum
V Minimum
feet
(meter)
feet
(meter)
5
(.524)
Elbow Only
5
(.524)
(0.305)
0
(3.048)
2
(0.60)
5
(4.572)
3
(0.94)
20
(6.096)
4
(.29)
H
+ H
= 20 feet (6.096 m) Max.
V
+ V
+
H
+ H
= 60 ft. (8.3 m) Max.
Typical termination shown.
Summary of Contents for Merit MLDVT-45NE
Page 29: ...29 NOTES...
