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LENNOX HEARTH PRODUCTS • MERIT
VERTICAL TERMINATION SYSTEMS (ROOF)
See Figure 15 on Page 13 and Figures 23-
25 on Pages 16 and 17 and their associated
Vertical Vent Tables which illustrate the various
vertical 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 Vertical
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 these vertical vent systems terminate
through the roof. The minimum vent height
above the roof and/or adjacent walls is speci-
fied in ANSI Z223.1-(latest edition) (In Canada,
the current CAN/CSA-B149.1 installation code)
by major building codes. Always consult your
local codes for specific requirements. A general
guide to follow is the Gas Vent Rule (refer to
Figure 4B on Page 6).
A vent restrictor may need to be installed when
vertical termination is used. See Installation of
Vent Restrictor on Page 12 for guidelines.
Vertical (Straight) Installation
Determine the number of straight vent 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
(see Tables on this page and Page 34 - Vent
Sections). It is recommended that you plan the
vent lengths so that a joint does not occur at
the intersection of ceiling or roof joists. Refer
to the Vent Section Length Chart.
SV4.5CGV-1
SV4.5FA OR
Termination
SV4.5FB Flashing
AND SV4.5SC
STORM COLLAR
1" (25.4 mm)
Minimum
Clearance to
Combustibles
SV4.5VF
Firestop/Spacer
40' Max
SV4.5L6/12/24/36/48
(12.2 M)
Vent Sections
When using Secure Flex
use Firestop/Spacer
SF4.5VF
Figure 15
SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES • MODEL MLDVTCD-35 • INSTALLATION INSTRUCTIONS
®
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Note: Convert inches into metric equivalent
measurement, as follows:
Millimeters (mm) = Inches x 25.4
Centimeters (cm) = Inches x 2.54
Meters (M) = Inches x .0254
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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Effective Vent Length
Model
Effective Length
SV4.5L6
SV4.5L12
SV4.5L24
SV4.5L36
SV4.5L48
Table 7
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8 4
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4 3
1 -
2 /
6 4
1 -
2 /
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0
3
4
0
3
4
0
3
5
0
3
5
5
0
5
5
0
6
5
0
6
0
4
4
0
4
5
0
4
5
5
0
7
6
0
6
6
0
7
6
0
7
6
0
7
0
5
5
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5
6
7
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7
0
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6
6
8
0
9
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6
7
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6
7
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6
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7
7
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0 1
0
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0
1 1
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8
8
0
8
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1 1
0
1 1
0
9
9
0
9
0 1
0
0 1
0 1
4-1/2"
10-1/2"
22-1/2"
34-1/2"
46-1/2"
13
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