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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
TYPICAL INSTALLATION
SEQUENCE
The typical sequence of installation is outlined
below.
Note: Each installation is unique and
may result in variations to the steps
described herein.
See the page numbers referenced in the fol-
lowing steps for detailed procedures.
Step 1. FRAMING (Page 10): Construct
appliance framing. Position
appliance within framing; and
secure with nailing brackets.
Step 2. ROUTE GAS LINE (Page 13):
Route gas supply line to right side
(when viewed from control side of
appliance).
Step 3. INSTALL VENT SYSTEM (Page 14):
install vent system and exterior
termination.
Step 4. FIELD WIRING (Page 23): Connect
120 Vac electrical power to the
appliance receptacle.
Step 5. REMOVE GLASS DOOR ASSEMBLY
(Page 23).
Step 6. CONNECT GAS LINE (Page 24):
Make connection to gas supply.
Step 7. INSTALL FIREBOX LINER PANEL
KIT (Page 25).
Step 8. VERIFY APPLIANCE OPERATION
(Page 25).
Step 9. INSTALL VOLCANIC STONE,
GLOWING EMBERS, AND LOGS
(Page 26).
Step 10. INSTALL GLASS DOORS, MESH
PULL SCREENS, AND MODESTY
PANEL (Page 29).
Step 11. BURNER ADJUSTMENTS (Page
30): Adjust burner air shutter to
ensure proper flame appearance.
FINISHING REQUIREMENTS (Page 31).
Step 12. ATTACHING SAFETY-IN-
OPERATION WARNINGS (Page 33).
PRE-INSTALLATION STEPS
The appliance is shipped with all gas controls
and components installed and pre-wired.
1. Remove the shipping carton, exposing the
front glass door on the control side.
2. Using a Phillips screwdriver, unfasten two
(2) screws located at the top of the glass
frame (see Figure 50 on Page 29). Tilt the
top of the glass frame away from the unit.
Lift it carefully off the bottom door track
and set the door aside, protecting it from
inadvertent damage.
LENNOX HEARTH PRODUCTS • MONTEBELLO
®
SEE-THROUGH DIRECT-VENT GAS FIREPLACES (LSM40ST-N / LSM40ST-P) • INSTALLATION INSTRUCTIONS
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.
Left Side Front Corner of Fireplace Shown
(Same requirements for right side)
Note: The nailing anges, combustible
members and screw heads in areas directly
adjacent to the nailing anges are EXEMPT
from the 1/2-inch clearance to combustible
requirements for the rebox outer wrapper.
Combustible framing may be in direct
contact with the nailing flanges and may
be located closer than 1/2 inch from screw
heads and the rebox wrapper in areas
adjacent to the nailing anges. Frame the
opening to the exact dimensions specified
in the framing details in these Installation
Instructions.
Figure 11
Use Top Flange for
1/2” Thick Drywall
Front of Fireplace
Use Center Flange
for Flush Mount
Use Bottom Flange for
5/8” Thick Drywall
DETAILED INSTALLATION STEPS
Step 1. FRAMING
Frame these appliances as illustrated in Figure
12 on Page 11. All framing details must allow
for a minimum clearance to combustible fram-
ing members as shown in Table 5 and Figures
8–10 on Page 9.
If the appliance is to be elevated above oor
level, a solid continuous platform must be
constructed below the appliance.
Headers may be in direct contact with the
appliance top spacers but must not be sup-
ported by them or notched to t 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 anges — one
top and bottom on each side of the replace
front (see Figure 11). Use 8d nails or their
equivalent.
Securing Unit to Framing
by Nailing Flanges