6
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Maintain a minimum " (25 mm) clearance to
combustibles on the vertical sections. Clear-
ances for the horizontal runs are; 3" (76 mm)
on top, " (25 mm) on sides, and " (25 mm)
at the bottom.
B.
Frame exterior wall opening -
Locate the center of the vent outlet on
the exterior wall according to the dimen-
sions shown in
Figure 12 on Page 9.
Cut
and/or frame an opening, 10-1/2" x 12 1/8"
(267 mm x 308mm) inside dimensions, about
this center.
C.
Frame ceiling opening -
If the vertical route
is to penetrate a ceiling, use plumb line to locate
the center above the appliance. Cut and/or frame
an opening, 10-1/2" x 10-1/2" (267 mm x 267
mm) inside dimensions, about this center (refer
to
Figure 16 on Page 3
).
u
Ceiling
Firestop / Spacer
(SV4.5VF)
v
Wall 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
H
V
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 total 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
.
Table B
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.
Figure 25 - Top Vent - THREE ELBOWS
VERTICAL VENT FIGURES/TABLES
(CONTINUED)
HORIZONTAL (OUTSIDE WALL)
TERMINATION SYSTEM
Figure 26 on Page 7, and Figures 27 to 32 on
Pages 8 to 2
and their associated Horizontal
Vent Table illustrate the various horizontal
venting configurations that are possible for
use with these appliances.
Secure Vent
pipe
applications are shown in these Figures;
Secure
Flex
pipe may also be used. A Horizontal Vent
Table summarizes each system’s minimum and
maximum vertical and horizontal length values
that can be used to design and install the vent
components in a variety of applications.
Both of these horizontal vent systems terminate
through an outside wall. Building Codes limit or
prohibit terminating in specific areas. Refer to
Figure 6
on Page 6
for location guidelines.
Secure Vent
SV4.5 direct vent system compo-
nents are unitized concentric pipe components
featuring positive twist lock connection, (
refer
to
Figure 17
on Page 3
). All of the appli-
ances covered in this document are fitted with
collars having locking inclined channels. The
dimpled end of the vent components fit over
the appliance collar to create the positive twist
lock connection.
A.
Plan the vent run -
Analyze the vent routing and determine the
types and quantities of sections required
4-1/2" (114 mm), 10-1/2" (267 mm), 22-1/2"
(572 mm), 34-1/2" (876 mm) and 46-1/2" (1181
mm) net section lengths are available. Plan the
vent lengths so that a joint does not occur at the
intersection of ceiling or roof joists. Make allow-
ances for elbows as indicated in
Figure 19
.
Summary of Contents for Merit MLDVT-45NE
Page 29: ...29 NOTES...
