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LENNOX HEARTH PRODUCTS • MONTEBELLO
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.
Vertical Termination System
with Straight Vertical Venting
Termination
Flashing and
Storm Collar
Min. 1 in (25 mm)
Clearance to
Combustibles
Firestop/Spacer
Max. 60 ft
(18 m)
Secure Vent
Vent Sections
Min. 6 ft
(1.8 m)
(SV8L6, SV8L12,
SV8L24, SV8L36,
SV8L48)
Figure 17
SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS
®
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Available Straight Vent Sections
Cat. No. Model No.
h2250
SV8L6
6 in (152 mm) Vent Section
h2251
SV8L12
12 in (305 mm) Vent Section
h2252
SV8L24
24 in (610 mm) Vent Section
h2253
SV8L36
36 in (914 mm) Vent Section
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.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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Description
Effective Length
4.5 in (114 mm)
10.5 in (267 mm)
22.5 in (572 mm)
34.5 in (876 mm)
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Metric
Conversion
Inches x 25.4 = mm.
Inches x 2.54 = cm.
Inches x 0.0254 = m.
T
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