Lennox Hearth INTERTEK LMBV-42REN - Manual (Page 9)

9
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
CAUTION
THIS AppLIANCe CANNOT be veNTeD HORIZONTALLY.
LENNOX HEARTH PRODUCTS • MERIT ® SERIES B-VENT GAS FIREPLACES • 42" LMBV MODELS • INSTALLATION INSTRUCTIONS
12 ft.
Minimum 60*
degrees
Maximum
Back View
Of Appliance
12 ft.
Minimum
Back View
Of Appliance
*12 ft. Min.
**15 ft. Min.
2 ft.
Minimum
To Offset
*with an offset up to 45 degrees
** with an offset greater than 45
degrees and up to 60 degrees
Back View
Of Appliance
*This Vent Configuration
Allowable only With The
Following optional Non-
Operable Glass Doors Installed:
42GEP or 42GEP-BB Figure 11
1 2 3
Figure 10
Step 3. position Appliance
Slide the fireplace into prepared framing or posi-
tion fireplace in its final position and frame later.
Refer to fireplace drawings and specifications
on Page 7 for framing dimensions and details.
Framing header may be positioned directly on
the fireplace top spacers.
ImpORTANT: UNDeR NO CIRCUmSTANCeS
CAN THe FIRepLACe TOp SpACeRS (REFER
TO FIGuRE 8) be RemOveD OR mODIFIeD,
NOR mAY YOU NOTCH THe HeADeR TO FIT
AROUND OR be INSTALLeD LOWeR THAN THe
SpACeRS. THe HeADeR mAY be IN DIReCT
CONTACT WITH THe TOp SpACeRS bUT mAY
NOT be SUppORTeD bY THem.
Fireplace should be secured to side framing
members using the full length 1/2" nailing
flanges that are integral to the appliance at each
side. Use 8d nails or equivalent.
NOTE: The nailing tabs and the area directly
behind the nailing tabs are exempt from the clear-
ances described on the fireplace clearance label.
6”
Type B-Vent
Flue Outlet
Collar
Securing
Screws
Step 4. Install vent System and
exterior Termination
A. Connect a 6" (152 mm) Type B vent system
to the appliance flue collar with four (4)
No. 8 sheet metal screws (Figure 10) and
install the remainder of the Type B vent to
the outside.
b. The following venting configurations may
be installed (see Figure 11):
 - vertical - Minimum overall height of
the vent system and appliance without an
offset must be 12' (3.66 m)
 - With Offset
a. Minimum overall height of the vent
system and appliance must be 12' (3.66
m) when an offset up to 45 degrees
from the vertical is used. There must
be a minimum vertical vent height of
2 ft (0.6 m) above the appliance collar
before the offset can be applied.
b. Minimum overall height of the vent
system and appliance must be 15'
(4.57 m) when an offset, more than
45 degrees but less than 60 degrees
from the vertical, is used. There must
be a minimum vertical vent height of
2 ft (0.6 m) above the appliance collar
before the offset can be applied.
 - With Offset, when using the optional,
42Gep or 42Gep-bb, non-operable glass
doors
Minimum overall height of the vent system
and appliance must be 12' (3.66 m) when
an offset up to 60 degrees from the vertical
is used. The lower part of the offset may
start at the appliance flue collar.
Maximum overall height of the vent system and
appliance should not exceed 40 feet (12.19 m).
Install the B-vent system in accordance with the
vent manufacturer's instructions.
CAUTION: THIS AppLIANCe CANNOT be
veNTeD HORIZONTALLY.
NOTE: Refer to the vent manufacturers instal-
lation instructions for variations of venting
techniques. If common venting of several units
is contemplated, it should be discussed with an
architect and the local Building Department.
Install the B-vent system in accordance with
the vent manufacturer's instructions.