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NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Combustion Air Kit
Use combustion air kit, Model FOAK-4 or
), with these fireplace
systems. Refer to installation instructions
packed with the air kit for specific information.
Outside air drawn into the fireplace supplies air
to the fire for combustion. The outside air kit
must be installed before the fireplace is framed
and enclosed in the finished walls.
IMPORTANT: ALTHOUGH THE COMBUSTION
AIR KIT IS DESIGNATED AS AN OPTIONAL
ACCESSORY IT IS HIGHLY RECOMMENDED
THAT IT BE INSTALLED. DUE TO THE OPER-
ATING CHARACTERISTICS OF MULTI-OPEN
FIREPLACES, A PROPERLY INSTALLED
SOURCE OF OUTSIDE COMBUSTION AIR CAN
ENHANCE THE OPERATING PERFORMANCE
OF THE APPLIANCE. THE COMBUSTION AIR
KIT IS NOT REQUIRED FOR THE SAFE OP-
ERATION OF THE LS43ST.
There is a one-hand operated shut-off valve
located on each side of the fireplace opening
behind the screen. Refer to label for directions
of operation. The combustion air damper
should be fully open when the fireplace is in
operation and fully closed when the fireplace is
not in use to prevent outside air from entering
If additional length of duct is necessary,
purchase locally available 4 inch diameter
(12.5 in.²) Class 0 or Class 1 ducting. The
duct may extend up to 50' (15.2 m) in any
Outside combustion air may be run upwards
or vertically through framing and ceiling joists,
with the hood installed through an outside wall
and 3' (914 mm) below the termination. Duct-
ing may also be run downward through floor
joists and under the home to a ventilated
crawlspace not considered part of the living
area of the home.
CHIMNEY OFFSET 30° THROUGH FLOOR
It may be necessary to assemble the chimney
at 30° when passing through the floor or
ceiling area. Use the F10FS30-2 firestop
spacer as shown in
Figures 42 and 43
Support the chimney at floor or ceiling pen-
etration with a FTF13 stabilizer if distance of
chimney below ceiling is 10' (3 m) or more.
Maintain 2" (51 mm) minimum air space to
combustibles from chimney sections. The
chimney must pass vertically through the
The LS43ST fireplace require the use of glass
doors. The selection of glass doors available
for use with these fireplace are: 43LSBF,
43LSBF-B, 43LBF, 43LBF-BB, 43LBF-BS and
43TBA. The use of any other non-listed door
on these fireplaces may result in a potential
fire hazard and is not recommended.
IMPORTANT: IT IS NECESSARY TO ORDER
AND INSTALL THE DOOR STYLE OF YOUR
CHOICE. GLASS DOORS ARE NOT OPTIONAL.
and Attic Above
and Room Above
CAUTION: REMOVE THE PLASTIC PROTEC-
TIVE COATING FROM THE DOORS BRASS
PIECES BEFORE ASSEMBLY AND INSTALLA-
TION. FAILURE TO REMOVE THE COATING
BEFORE FIRST USE WILL RESULT IN DAM-
AGE TO THE BRASS FINISH.
Make a careful inspection of all parts before
installing the doors to insure they are un-
damaged and complete. Always use two (2)
glass door assemblies for each side of the
CAUTION: DO NOT TOUCH THE DOORS WITH
YOUR HANDS WHILE THE FIREPLACE IS IN
USE. ALWAYS USE DOOR HANDLES.
DOORS WILL BECOME VERY HOT WHEN
FIREPLACE IS IN USE.
Note: Design characteristics of a dual-opening
fireplace (whether masonry or factory-built)
may cause it to not draft properly and smoke.
For this reason, glass doors are required with
the LS43ST fireplace.
WARNING: THESE FIREPLACES
SHOULD BE OPERATED ONLY WITH
THE DOORS FULLY OPEN OR FULLY
FIGURES 44 AND 45
DOORS ARE LEFT PARTLY OPEN, GAS
AND FLAME MAY BE DRAWN OUT OF
THE FIREPLACE OPENING, CREATING
RISKS OF BOTH FIRE AND SMOKE.