on a combustible surface, install the metal safety strip under the
front
edge of the fireplace as shown in
FIG.
9. If you desire
the
fireplace
on a
raised
hearth,
then make sure that the
fireplace
rests on a solid continuous
platform.
If the
platform
is
on an exterior wall of the home then it should be insulated with insulation with the same R factor as the exterior walls of
the structure.
Level
the fireplace using shims if necessary. If the fireplace is not level it could move after installation.
Step
3. Now you are ready to
cut
the
holes
in
the
ceiling for
the
chimney.
Drop a
plumb
line
from
the
ceiling directly above
the
fireplace and
locate
the
point directly
above
the
flue
outlet
on
the
top
of
the
fireplace.
This
point
is
the
center
of
the
chimney.
Mark
this
point
and
measure
over
9
inches
in
each
direction.
The
18
inch
by
18
inch
square
formed is
the
opening
required
for
the
chimney.
For installation
of
the
TH42
use
91/2
inches
in
each
direction
and
a 19
by
19
hole.
See
FIG. 19.
This
same
procedure
should
be
followed
for
each
level
that
is
to
be
penetrated.
Step
4:
After
cutting
a
hole
in
the
last
ceiling,
you
are
now
ready
to
locate
and
cut
the
hole
in
the
roof
of
the
structure.
The
roof
hole
can
be
located
using
a
plumb
line
as
shown
in
Step
3.
However,
the
length
of
the
hole
through
the
roof
will
depend
on
the
pitch
of
the
roof
and
the
size
of
the
roof
joist
members.
Tables
5
and
6
give
the
various
roof
opening
sizes.
FIG.
20
shows
how
the
minimum
size
is
measured.
Step
5.
Framing
the
ceiling
and
roof
joist
openings
is
next.
Framing
is
necessary
to
maintain
the
structural
integrity
of
the
joist
area.Crossmembers
should
be
nailed
as
shown
in
FIG.
21.
A.
CHIMNEY
OPENING
TH28&TH36-18"
x
18*
TH42-19"
x
19"
B.
TH28&TH36-9"
TH42-9'/i"
sa
>1
m
PLUMB
"LINE
FIG.
19
CUTTING
CEILING
OPENINGS
ROOF
OPENING
PITCH
:
(SEE
CHART)
r
MINIMUM
TO
COMBUSTIBLES
FIG.
20
ROOF
FIG.
21
SEE
TABLE
5
FOR
TH28,
TH36
SERIES
SEE
TABLE
6
FOR
TH42
SERIES
18"
FOR
TH28,
TH36
19"
FOR
TH42
18"
FOR
TH28,
TH36
19"
FOR
TH42
18"
FOR
TH28,
TH36
19"
FOR
TH42
Page 13
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