Osburn
Matrix
Inbuilt
Installation
and
Operation
Manual
______________________________________________________________________________
33
Data
for
Floor
Protection
Calculation
MINIMUM
EXTENDED
A
B
(Note
1)
C
D
AIR
JACKET
MILLIMETRES
Dimension
of
the
hearth
extension
500
mm
0
mm
D
=
B
‐
(A
‐
C)
Flush
with
fireplace
facing
MAXIMUM
EXTENDED
A
B
(Note
1)
C
D
AIR
JACKET
MILLIMETRES
Dimension
of
the
hearth
extension
500
mm
51
or
102
mm
D
=
B
‐
(A
‐
C)
Back
from
fireplace
facing
51
or
102
mm