Figure 15 – Lennox Hearth B-MNC0353VDE User Manual
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SV4.5CGV-1
Termination
SV4.5FA OR
SV4.5FB Flashing
AND SV4.5SC
STORM COLLAR
*SV4.5VF
Firestop/Spacer
SV4.5L6/12/24/36/48
Vent Sections
40' Max
(12.2 M)
1" (25.4 mm)
Minimum
Clearance to
Combustibles
*When using Secure Flex,
use Firestop/Spacer
SF4.5VF
Figure 15
Preparing the Appliance Top Vent Outlet when
vertically terminating the vent system above
the roof
Install a vent restrictor (provided) in the appli-
ance top flue outlet as shown in
Figure 14. It
is held in place by friction, only.
Select Venting System - Horizontal or Vertical
With the appliance secured in framing, deter-
mine vent routing and identify the exterior
termination location. The following sections
describe vertical (roof) and horizontal (exterior
wall) vent applications. Refer to the section
relating to your installation. A list of approved
venting components is shown in the tables on
pages 26 and 27.
VERTICAL TERMINATION SYSTEMS (ROOF)
Figures 15, and 25 through 29 on pages 14
and 15 and their associated Vertical
Vent Tables illustrate the various vertical vent-
ing configurations that are possible for use with
these appliances. Secure Vent pipe applica-
tions are shown in these figures; Secure Flex
pipe may also be used. A Vertical Vent Table
summarizes each system’s minimum and maxi-
mum 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-1 B149 installation code) by
major building codes. Always consult your
local codes for specific requirements. A gen-
eral guide to follow is the Gas Vent Rule (refer
to
Figure 4 on page 5).
Vertical (Straight) Installation
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. 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.