Matrix
Insert
Installation
and
Operation
Manual
34
______________________________________________________________________________
8.3
COMPLIANCE
OF
A
COMBUSTIBLE
MANTEL
SHELF
To
ensure
compliance
of
an
existing
mantel
shelf
or
to
install
a
combustible
mantel
shelf,
refer
to
table
and
figure
below.
For
example,
a
mantel
shelf
with
a
8’’
depth
(203
mm)
((X)
value)
must
be
installed
at
least
18
5/8"
(473
mm)
((I)
value)
above
the
top
of
the
insert
(see
figure
below).
Different
mantel
shelf
dimensions
are
listed
in
the
following
table.
However,
no
combustible
mantel
shelf
can
be
installed
at
less
than
18
5/8"
(473
mm)
above
the
top
of
the
insert.
If
the
depth
of
the
mantel
shelf
is
not
listed
in
the
table
below,
add
10
5/8"
(270
mm)
to
the
depth
of
your
mantel
shelf
to
obtain
the
safe
positioning
of
your
mantel
shelf.
For
example,
for
a
9"
(229
mm)
mantel
shelf,
the
safe
positioning
would
be
19
5/8"
(499
mm)
above
the
top
of
the
insert
(10
5/8"
(270
mm)
+
9"
(229
mm)).
MAXIMUM
MANTEL
SHELF
DIMENSION
(X)
MANTEL
SHELF
CLEARANCES
(I)
8"
/
203
mm
18
5/8"
(473
mm)
10"
/
254
mm
20
5/8"
(524
mm)
12"
/
305mm
22
5/8"
(575
mm)
