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LENNOX HEARTH PRODUCTS • MONTEBELLO
VERTICAL TERMINATION SYSTEMS (ROOF)
See Figure 15 and Figures 23 through 25 on
Page 16 and their associated Vertical Vent
Tables which illustrate the various vertical
venting configurations that are possible for
use with these appliances. Secure Vent
applications are shown in these Figures. 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.
The vertical vent system terminates through
the roof. The minimum vent height above
the roof and/or adjacent walls is specified 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 4 on Page 6).
Vertical (Straight) Installation
(Figure 15)
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 Page 30—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.
Figure 15
DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
®
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Table 7: Vent Section Length Chart
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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Model
Effective Length
SV8L6
SV8L12
SV8L24
SV8L36
SV8L48
Table 8: Effective Vent Length
T
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8 4
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4 3
1 -
2 /
6 4
1 -
2 /
L
S
c e
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s n
Q
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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
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7
6
0
7
6
0
7
0
5
5
0
5
6
7
0
7
7
0
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8
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6
6
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6
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6
7
9
0
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9
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0 1
0
7
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8
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1 1
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8
0
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1 1
0
1 1
0
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9
0
9
0 1
0
0 1
0 1
4-1/2 in.
10-1/2 in.
22-1/2 in.
34-1/2 in.
46-1/2 in.
13
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