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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
15
Available Straight Vent Sections
Cat. No. Model No. Description Effective Length
H2250 SV8L6 6 in (152 mm) Vent Section 4.5 in (114 mm)
H2251 SV8L12 12 in (305 mm) Vent Section 10.5 in (267 mm)
H2252 SV8L24 24 in (610 mm) Vent Section 22.5 in (572 mm)
H2253 SV8L36 36 in (914 mm) Vent Section 34.5 in (876 mm)
H2254 SV8L48 48 in (1219 mm) Vent Section 46.5 in (1181 mm)
Table 7 See Page 34 for a list of all approved venting components.
Figure 17
Vertical (Roof) Termination
Systems
This section includes configurations for vertical
(roof) termination systems with either straight
vertical venting (see below and Page 18) and
offset vertical venting (see Pages 16–18).
Secure Vent™ rigid vent pipe and termination
components are shown in the figures.
The tables on Page 18 summarize each sys-
tem’s minimum and maximum vertical and
horizontal length values.
For vertical (roof) termination, the minimum
vent height above the roof and/or adjacent
walls is specified in ANSI Z223.1, latest edi-
tion (in Canada, the current CAN/CSA-B149.1
installation code) and by major building
codes. Always consult your local codes for
specific requirements. A general guide to
follow is the Gas Vent Rule (see Figure 3B
on Page 6).
Vertical Termination System
with Straight Vertical Venting
Note: If not already done, install the pro-
vided vent restrictor before proceeding
(see Page 14).
Determine the number of straight vent sec-
tions required. Available straight vent sec-
tions (and their effective lengths) are listed in
Table 7, below. See Page 34 for all venting
components.
Plan the vent lengths so a joint does not occur
at the intersection of ceiling or roof joists.
Refer to the “VENT SECTION LENGTHS”
charts at right.
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9 57.0 2 0 0 0 0 2
5.01 578.0 0 1 0 0 0 1
51 52.1 1 1 0 0 0 2
5.91 526.1 2 1 0 0
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3
12 57.1 0 2 0 0 0 2
5.22 578.1 0 0 1 0 0 1
5.52 521.2 1 2 0 0 0 3
5.13 526.2 0 3 0 0 0 3
5.43 578.2 0 0 0 1 0 1
5.73 521.3 1 1 1 0 0 3
5.34 526.3 0 2 1 0 0 3
54 57.3 0 0 2 0 0 2
5.64 578.3 0 0 0 0 1 1
5.94 521.4 1 0 2 0 0 3
15 52.4 1 0 0 0 1 2
5.55 526.4 0 1 2 0 0 3
75 57.4 0 0 1 1 0 2
66 52.5 0 2 2 0 0 4
5.76 526.5 0 0 3 0 0 3
96 57.5 0 0 0 2 0 2
27 6 1 0 3 0 0 4
5.37 521.6 1 0 0 2 0 3
5.97 526.6 0 1 0 2 0 3
18 57.6 0 0 0 1 1 2
09 5.7 0 2 1 0 1 4
5.19 526.
7 0 0 2 0 1 3
39 57.7 0 0 0 0 2 2
69 8 1 0 1 2 0 4
5.79 521.8 1 0 0 0 2 3
201 5.8 2 0 0 0 2 4
5.301 526.8 0 0 0 3 0 3
801 9 1 0 0 3 0 4
411 5.9 0 2 0 0 2 4
711 57.9 1 0 5 0 0 6
5.811 578.9 1 1 0 3 0 5
621 5.01 0 0 1 3 0 4
5.031 578.01 1 0 1 3 0 5
531 52.11 0 0 6 0 0 6
831 5.11 0 0 0 4 0 4
5.931 526.11 0 0 0 0 3 3
5.241 578.11 1 0 0 4 0 5
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441 21 1 0 0 0 3 4
051 5.21 0 1 0 0 3 4
5.451 578.21 1 1 0 0 3 5
5.061 573.31 0 2 0 0 3 5
5.271 573.41 0 0 0 5 0 5
771 57.41 1 0 0 5 0 6
381 52.51 0 1 0 5 0 6
681 5.51 0 0 0 0 4 4
5.091 578.51 1 0 0 0 4 5
5.691 573.61 0 1 0 0 4 5
5.502 521.71 0 1 1 5 0 7
702 52.71 0 0 0 6 0 6
5.112 526.71 1 0 0 6 0 7
5.712 521.81 0 1 0 6 0 7
5.922 521.91 0 0 1 6 0 7
5.232 573.91 0 0 0 0 5 5
732 57.91 1 0 0 0 5 6
5.142 521.02 0 0 0 7 0 7
642 5.02 1 0 0 7 0 8
252 12 0 1 0 7 0 8
462 22 0 0 1 7 0 8
672 32 0 0 0 8 0 8
972 52.32 0 0 0 0 6 6
5.082 573.32 1 0 0 8 0 9
5.382 526.32 1 0 0
0 6 7
5.982 521.42 0 1 0 0 6 7
5.103 521.52 0 0 1 0 6 7
5.013 578.52 0 0 0 9 0 9
513 5.62 1 0 0 9 0 01
5.523 521.72 0 0 0 0 7 7
033 5.72 1 0 0 0 7 8
633 82 0 1 0 0 7 8
543 57.82 0 0 0 01 0 01
5.943 521.92 1 0 0 01 0 11
273 13 0 0 0 0 8 8
5.673 573.13 1 0 0 0 8 9
5.973 526.13 0 0 0 11 0 11
5.814 578.43 0 0 0 0 9 9
324 52.53 1 0 0 0 9 01
564 57.83 0 0 0 0 01 01
HSTGNELNOITCESTNEV
Firestop/Spacer
Termination
Flashing and
Storm Collar
Min. 1 in (25 mm)
Clearance to
Combustibles
Secure Vent
Vent Sections
(SV8L6, SV8L12,
SV8L24, SV8L36,
SV8L48)
Max. 60 ft
(18 m)
Min. 6 ft
(1.8 m)
Vertical Termination System
with Straight Vertical Venting
Metric
Conversion
Inches x 25.4 = mm.
Inches x 2.54 = cm.
Inches x 0.0254 = m.
LENNOX HEARTH PRODUCTS • MONTEBELLO
®
SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS