NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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LENNOX HEARTH PRODUCTS • ESTATE™ SERIES WOOD-BURNING FIREPLACES • MODELS EST-36, EST-42, EST-50 • INSTALLATION INSTRUCTIONS
Figure 2
locatIon of fIrEplacE
Carefully select the proper location for heat
circulation, aesthetics, chimney obstructions
and clearance to side wall(s). With proper pre-
planning, a slight adjustment of a few inches
can save considerable time and expense later
during construction and assembly.
chase Enclosure
A chase is a vertical box-like structure construct-
ed to surround the fireplace and chimney. Refer
to Figure 2 for a typical chase configuration. As
with all chimney installations, avoid overhead
obstructions such as trees, power lines, etc.
A chase should be constructed and insulated
just like any outside wall. In a cold climate, we
recommend the base of the chase should also
be insulated between the solid continuous floor
beneath the fireplace and the chase bottom.
Chase insulation in a cold climate installation
is not required for safety.
assEmbly outlInE - before you start
Check your inventory list to be sure you have
all the necessary parts supplied in good usable
condition. Check also for any concealed damage.
Check the operation of the damper. The damper
is controlled through the use of a control lever
located within the rebox opening at the top
center just behind the rebox lintel (Figure 3).
Est-36 and 42 models: To lock the damper
blade in the OPEN position, push the damper
handle back and up (away from the front of
the fireplace). To lock the damper blade in
the CLOSED position, pull the damper handle
FORWARD and DOWN (towa rd the front of
the fireplace).
Est-50 model: To lock the damper blade in
the OPEN position, pull the damper handle
FORWARD and DOWN (toward the front of
the fireplace). To lock the damper blade in the
CLOSED position, push the damper handle back
and up (away from the front of the fireplace).
Figure 3
Hearth
Hearth
Optional
Outside
Chase
Figure 4
Carefully consider the position of the fireplace
opening with respect to the location of adjacent
or nearby stairwells, bath or kitchen exhaust
fans and/or return air registers for forced air
furnaces/air conditioners that could cause a
smoking fireplace condition if the house is
tightly insulated.
When locating the replace, consideration must
be given to combustibles and final finishing.
See Figure 5 and confine the final location of
combustible finish materials to the “Safe Zone.”
Note: Do not insulate the chase cavity with
blown or fill type insulation materials.
chImnEy hEIght
The total height of your completed fireplace sys-
tem from the surface the fireplace rests on to the
chimney top must not exceed 80' (24.4m) and
must also meet minimum height requirements.
Refer to the minimum system height chart.
Note: Local codes may not require firestopping
at the ceiling levels for outside chase installa-
tions; however, it is recommended for safety
and the reduction of heat loss.
WarnIng
If insulation is used, the fireplace
must not be placed directly
against it. Insulation or vapor
barriers, if used, must first be
covered with gypsum board,
plywood, particle board or other
material to assure insulation and
vapor barriers remain in place.
WarnIng
do not pack or fill required
air spaces with insulation or
other material. no material is
allowed in these areas.
security chimneys™ ftf10 & ftf13 pipe
Installation Est-36 &
Est-42 Est-50
Vertical 16' 0" (4.8m) 17' 6" (5.3m)
one offset 18' 6" (5.6m) 20' 0" (6.1m)
two offsets 22' 0" (6.7m) 25' 0" (7.6m)
minimum system height Est-36 & Est-42
Est-50
Damper
OPEN Damper
CLOSED
Lintel
~
Combustion
Air Actuator
Damper
CLOSED Damper
OPEN
Lintel
~
Combustion
Air Actuator
Insulate Joists
Same as Ceiling
Draft Stops
F10FS-2 Firestop
FTF10-CTDTM
Termination
Note: Non-
Combustible
Chase
Flashing
Must be
Used to
Cover
Chase
Opening
Optional
Insulation
in Outside
Walls of
Chase
Solid
Continuous
Surface
Outside
Base
Insulation
(Thermal Barrier)
8’
(2.4m)
Level
Typical Installation