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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX MERIT
®
SERIES B-VENT GAS FIREPLACES • 36" LMBV MODELS • INSTALLATION INSTRUCTIONS
FRAMING SPECIFICATIONS
Figure 4
Figure 5
Figure 6
PRE-INSTALLATION NOTES
The fireplace may be installed directly on a
combustible oor or raised on a platform of an
appropriate height. Do not place replace on
carpeting, vinyl or other soft oor coverings. It
may, however, be placed on at wood, plywood,
particle board or other hard surfaces. Be sure
replace rests on a solid continuous oor or
platform with appropriate framing for support
and so that no cold air can enter the room from
under the fireplace.
The fireplace may be positioned and then the
framing built around it, or the framing may be
constructed and the fireplace positioned into
the opening.
Usually, no special oor support is needed for
the fireplace, however, to be certain:
1. Estimate the total weight of the fireplace
system and surround materials such as brick,
stone, etc., to be installed.
2. Measure the square footage of the oor space
to be occupied by the system, surrounds and
hearth extensions.
3. Note the oor construction, i.e. 2 x 6’s, 2
x 8’s or 2 x 10’s, single or double joists, type
and thickness of oor boards.
4. Use this information and consult your local
building code to determine if you need ad-
ditional support.
If you plan to raise the fireplace and hearth
extension, build the platform assembly then
position fireplace and hearth extension on
top. Secure the platform to the oor to prevent
possible shifting.
INSTALLING THE FIREPLACE
Step 1. Construct Appliance Framing
Frame appliance enclosure as illustrated in
Figures 4 through 7.
Note: The framed depth, 20-5/8" (524 mm)
from a framed wall, must always be measured
from a finished surface. If a wall covering such
as drywall is to be attached to the rear wall,
then the 20-5/8" (524 mm) must be measured
from the drywall surface. It is important that
this dimension be exact.
If the appliance is to be elevated above oor
level, a solid continuous platform must be
constructed.
The header may rest on the top metal spacers,
but must not be notched to fit around them.
Consult all local codes.
Framing Dimensions
A 42-1/4" 1073 mm
B 37-1/2" 953 mm
C 28-3/4" 730 mm
D 15-3/8" 391 mm
E 70" 1778 mm
F 35" 889 mm
G 20-5/8" 524 mm
H* 4" 102 mm
J 19-5/8" 498 mm
K 49-1/2" 1257 mm
Note: All framing dimensions calculated for
1/2" dry wall at the appliance face. If sheath-
ing the chase or finishing with other thickness
materials, calculations will need to be made.
* When FOAK is used.
Figure 7
TYPICAL INSTALLATION SEQUENCE
The typical sequence of installation is outlined
below; however, each installation is unique,
resulting in variations to the steps described
herein.
Framing Specifications ......................page 6
Pre-Installation Notes .......................page 6
Installing the Fireplace:
Step 1. Construct Appliance
Framing ......................page 6
Step 2. Route Gas Line .................page 7
Step 3. Position Appliance ............page 7
Step 4. Install Vent System and
Exterior Termination ...page 7
Step 5. Field Wiring; Install (Optional)
Wall Switch ................page 8
Step 6. Connect to Gas Line .........page 8
Step 7. Install (Optional) Outside
Air Kit .........................page 9
Step 8. Install Logs and
Glowing Embers .........page 10
Appliance Operation:
Step 9. Check Appliance
Operation ....................page 10
Manual Limit Switch ....page 10
Millivolt Checkout ........page 10
Electronic Checkout .....page 10
Step 10. Adjust Burner ...................page 11
Step 11. Attach "Safety-in-
Operation" Warnings ..... page 12
Header
B
A
Fireplace Framing
Corner Installation
K
D
C
A
E
F
Back Wall of Chase/Enclosure
Including Finishing Materials
if any
Rough
Framing Face
(Unfinished Shown)
FOAK Combustion
Air Kit, Optional
Optional FOAK
Combustion
Air Kit
A
Outside Chase
G
C
J
Back Wall of Chase/Enclosure
Including Finishing Materials
if any
Rough Framing Face
(Unfinished Shown)
C
A
G
Inside Chase
Back Wall of Chase/Enclosure
Including Finishing Materials
if any
Rough Framing Face (Unfinished Shown)
H
H
Optional FOAK
Combustion Air Kit
FIREPLACE INSTALLATION