13
LENNOX HEARTH PRODUCTS • MERIT PLUS
®
DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
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
SV4.5FA or
SV4.5FB Flashing
AND SV4.5SC
Storm Collar
SV4.5VF
Firestop/Spacer*
1 in (25.4 mm)
Minimum
Clearance to
Combustibles
SV4.5CGV-1
Termination
SV4.5L6/12/24/36/48
Vent Sections
*When using
Secure Flex
,
use Firestop/Spacer
SF4.5VF
.
Max. 40 ft
(12.2 m)
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Model
Effective Length
SV4.5L6
4-1/2"
SV4.5L12
10-1/2"
SV4.5L24
22-1/2"
SV4.5L36
34-1/2"
SV4.5L48
46 1/2"
Table 8 - Effective Vent Length
Figure 19
Table 7: Vent Section Length
VERTICAL TERMINATION SYSTEMS (ROOF)
See
Figure 19
and
Figures 27 through 29
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
®
pipe may also be 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 (In Canada, the current CAN/
CGA-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" (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
(see
Tables on this page
and
Pages 36 and
37 -
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.
