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LENNOX HEARTH PRODUCTS • MERIT
VERTICAL TERMINATION SYSTEMS (ROOF)
See Figure 20 and Figures 30 through 32
on Page 17 and their associated Vertical
Vent Tables, which illustrate the various verti-
cal 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 5 on Page 6).
Vertical (Straight) Installation
(Figure 20)
Determine the number of straight vent sec-
tions 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
Pages 35 and 36 - Vent Sections). 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
Termination
*When using Secure Flex,
use Firestop/Spacer
Max. 40 ft
SF4.5VF.
(12.2 m)
SV4.5L6/12/24/36/48
Vent Sections
Figure 20
14
PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
®
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4
5 .
9
0 1
5 .
5 1
9 1
5 .
1 2
2 2
5 .
5 2
5 .
1 3
5 .
4 3
5 .
7 3
5 .
3 4
5 .
5 4
6 4
5 .
9 4
5 .
1 5
5 5
5 .
7 5
6 6
7 6
5 .
9 6
2 7
3 7
5 .
9 7
5 .
1 8
0 9
SV4.5FA or
1 9
5 .
SV4.5FB Flashing
3 9
AND SV4.5SC
6 9
Storm Collar
7 9
5 .
1
2 0
1
3 0
5 .
1
8 0
1 in (25.4 mm)
1
4 1
Minimum
1
7 1
Clearance to
1
8 1
5 .
Combustibles
1
6 2
SV4.5VF
1
0 3
5 .
Firestop/Spacer*
1
5 3
1
8 3
1
9 3
5 .
1
2 4
5 .
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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3 .
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0
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0
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3
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1
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4
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3
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0
3
3
0
5
Effective Vent Length
Model
SV4.5L6
SV4.5L12
SV4.5L24
SV4.5L36
SV4.5L48
Table 7
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2 1
4 2
6 3
8 4
O
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0 1
1 -
2 /
2 2
1 -
2 /
4 3
1 -
2 /
6 4
1 -
2 /
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0
0
0
3
4
1
0
0
3
4
1
0
0
3
5
2
0
0
3
5
0
0
5
0
5
0
0
5
0
6
1
0
5
0
6
0
0
0
4
4
0
0
0
4
5
1
0
0
4
5
1
1
5
0
7
0
0
6
0
6
0
0
6
0
7
1
0
6
0
7
0
1
6
0
7
0
0
0
5
5
0
0
0
5
6
0
0
7
0
7
0
0
7
0
8
1
0
7
0
8
0
1
7
0
8
0
0
8
0
8
0
0
0
6
6
0
0
8
0
9
0
0
0
6
7
1
0
0
6
7
0
1
0
6
7
0
0
9
0
9
0
0
9
0
0 1
0
0
0
7
7
0
0
0
7
8
1
0
0
7
8
0
0
0 1
0
0 1
0
0
0 1
0
1 1
0
0
0
8
8
0
0
0
8
9
0
0
1 1
0
1 1
0
0
0
9
9
0
0
0
9
0 1
0
0
0
0 1
0 1
Effective Length
4-1/2"
10-1/2"
22-1/2"
34-1/2"
46-1/2"
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