Vertical Termination Systems; Vent Section Length Chart - Lennox MPDT33RNM Installation Instructions Manual
Merit plus series mpd direct-vent gas fireplaces
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LENNOX HEARTH PRODUCTS • MERIT PLUS
VERTICAL TERMINATION SYSTEMS (ROOF)
See Figure 19 and Figures 30 through
32 on Page 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
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
specified in ANSI Z223.1-2009 (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 19)
Determine the number of straight vent
sections required. 4 1/2 in. (114 mm),
10 1/2 in. (267 mm), 22 1/2 in. (572 mm),
34 1/2 in. (876 mm) and 46 1/2 in. (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 19
14
®
N
S
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4
5 .
9
pipe may also be
®
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
1 9
5 .
SV4.5FA or
3 9
SV4.5FB Flashing
6 9
AND SV4.5SC
7 9
5 .
Storm Collar
1
2 0
1
3 0
5 .
1
8 0
1
4 1
1 in (25.4 mm)
1
7 1
Minimum
1
8 1
Clearance to
1
6 2
Combustibles
1
0 3
SV4.5VF
1
5 3
Firestop/Spacer*
1
8 3
1
9 3
1
2 4
Table 7: Vent Section Length
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.
DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
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3 .
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Model
SV4.5L6
SV4.5L12
SV4.5L24
SV4.5L36
SV4.5L48
Table 8: Effective Vent Length
T
2 1
4 2
6 3
8 4
O
T
A
0 1
1 -
2 /
2 2
1 -
2 /
4 3
1 -
2 /
6 4
1 -
2 /
L
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Q
T
Y
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 in.
10 1/2 in.
22 1/2 in.
34 1/2 in.
46 1/2 in.
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