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LENNOX HEARTH PRODUCTS • MERIT
PRE-INSTALLATION STEPS
(Remove Glass Enclosure Panel)
The appliance is shipped with all gas controls
and components installed and pre-wired.
Note: Remove the glass enclosure panel
before installing the fireplace.
To remove the glass enclosure panel:
1. Remove the shipping carton, and then re-
move the shipping pad, exposing the front
glass panel.
2. Open the two latches securing the glass
panel (under the firebox floor).
3. Remove the glass panel by tilting it outward
at the bottom and lifting it up.
4. Set aside the glass enclosure panel in a
safe location to protect it from inadvertent
damage.
TYPICAL INSTALLATION
SEqUENCE
The typical sequence of installation is outlined
below, with page number references to the
related detailed instructions.
NOTE: Each installation is unique and may
result in variations to these steps.
Step 1. (Pages 8–10) Construct the appliance
framing.
Position the appliance within the
framing and secure with nailing
brackets.
IMPORTANT! Bend up the appropri-
ate top standoff spacers for the
drywall/finish material thickness to
be used (see Figure 7). Bend up the
outer pair for 1/2" ma terials and the
inner pair for 5/8" materials.
Bend up the outer pair for 1/2" ma-
terials and the inner pair for 5/8"
materials.
Bend out the appropriate nailing
flanges for the drywall/finish material
to be used.
Nailing flanges are provided for flush
framing, 1/2 inch and 5/8 inch fram-
ing depths (see Figure 7).
Step 2. (Page 11) Route the gas supply line
to the appliance location.
Step 3. (Page 11) Install the vent system and
exterior termination.
Step 4. (Page 12) Install field wiring.
a. Millivolt Appliances: Install the
operating control switch (not factory
provided).
b. Electronic Appliances: Field wire
and install operating control switch.
8
SERIES B-VENT GAS FIREPLACES • MODELS MLBV-35, MLBV-40 • INSTALLATION INSTRUCTIONS
®
Step 5. (Page 14) [OPTIONAL]: Install
outside supplemental combustion
air kit.
Step 6. (Page 15) Make connection to gas
supply.
Step 7. (Page 16) Verify appliance operation.
Step 8. (Page 17) Install the logs, decorative
volcanic stone, and glowing embers.
Step 9. (Page 20) Install the glass enclosure
panel.
Step 10. (Page 20) Adjust burner air shutter
to ensure proper flame appearance.
Step 11. (Page 22) Perform spillage test.
Step 12. (Page 23) Install hood.
Step 13. (Page 23) Complete finished interior
wall.
Step 14. (Page 24) Attach "Safety-in-
Operation" warnings.
dETAILEd INSTALLATION STEPS
Step 1. Construct Appliance
framing
Frame the appliance as illustrated in Figures
8-1 and 8-2. All framing details must allow for
a minimum clearance to combustible framing
members as shown in Table 6, Page 7.
If the appliance is to be elevated above floor
level, a solid continuous platform must be
constructed below the appliance.
Headers may be in direct contact with the appli-
ance top standoff spacers when they are bent
up vertically, maintaining the 3" clearance to
the fireplace top, but must not be supported
by them or notched to fit around them. All
construction above the appliance must be
self-supporting. DO NOT use the appliance
for structural support.
Secure the fireplace to the side framing mem-
bers using the unit's nailing flanges — one top
and bottom on each side of the fireplace front.
See Figure 7. Use 8d nails or equivalent.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
*IMPORTANT!
Bend up the
Top Standoff
Spacers before
installation.
Use outer pair
for 1/2" materials
and inner pair
for 5/8" materials.
Glass
Glass
Door
Enclosure
Panel
Glass Door
Side
Enclosure Panel
Spring Latch
Framing
Spring Latch
Nailing flanges are
provided at all four
Control
Lower
corners at 5/8", 1/2",
Compartment
Control
and flush settings.
Panel
Compartment
Panel
fireplace secured to framing
by nailing flanges
(Left side front corner of fireplace shown.
Right side requirements are the same.)
NOTE: The nailing flanges, combustible
members, and screw heads in areas directly
adjacent to the nailing flanges are EXEMPT
from the 1/2" clearance to combustible
requirements for the firebox outer wrapper.
Combustible framing may be in direct contact
with the nailing flanges and may be located
closer than 1/2" from screw heads and the
firebox wrapper in areas adjacent to the
nailing flanges.
Frame the opening to the exact dimensions
specified in the framing details in this manual.
Figure 7
WARNING
failure to position the parts in
accordance with these diagrams
or failure to use only parts specifi-
cally approved with this appliance
may result in property damage or
personal injury.
AVERTISSEMENT
Risque de dommages ou de
blessures si les pièces ne sont
pas installées conformément à
ces schémas et ou si des pièces
autres que celles spécifiquement
approuvées avec cet appareil sont
utilisées.
Header
Top
Spacing
Standoff
Top
Spacers*
Standoffs
5/8"
5/8"
Nailing
Nailing
Flange
Flange
1/2"
1/2"
Nailing
Nailing
Flange
Flange
Flush
Nailing
Flange
Fireplace
Nailing
Flanges
Flush
Nailing
Flange
Hood
Hood
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