20
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
V
H
H
v
Wall Firestop/Spacer
(SV4.5HF)
v
Wall Firestop/Spacer
(SV4.5HF)
v
When using Secure Flex,
use Firestop/Spacer
SF4.5HF.
u
Ceiling
Firestop/Spacer
(SV4.5VF)
u
Note - When using
Secure Flex
TM
, use
Firestop/Spacer SF4.5VF.
Table E
H
+ H
Maximum
V Minimum
feet
(meter)
feet
(meter)
3
(0.94)
Elbow Only
5
(.524)
(0.305)
0
(3.048)
2
(0.60)
5
(4.572)
3
(0.94)
20
(6.096)
4
(.29)
V +
H
+ H
= 60 feet (8.3 m) Max.
H
+ H
= 20 ft. (6.096 m) Max.
Figure 31
- Top Vent - TWO 90 DEGREE ELBOWS
See Table 10 on Page 19 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 29
.
Typical termination shown.
Summary of Contents for Merit MLDVT-45NE
Page 29: ...29 NOTES...
