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5
221098C
2 T y p e s o f I n s t a l l a t i o n a n d F l u e
Diagram 2.2
Diagram 2.1
50mm
MIN.
340mm
13
1
/
2
in.
760mm
30in.
2in.
3918 S
Opus illustrated
INSTALLATION CENTRE LINE
C
L
406mm
to
460mm
FRONT
OPENING
560mm
to
590mm
3919 S
3920 S
PREPARED
BASE
Diagram 2.3
BUILDERS
OPENING
INSTALLATION
CENTRE
LINE
C
L
REMOVE
COMBUSTIBLE
MATERIAL FROM
THIS AREA
PREPARED
BASE
280mm
280mm
220mm
220mm
560mm
680mm
135mm
1
/
2
in
1
/
2
in. 12mm
Non-
combustible
material
Note. Refer to Section 2 in the Back Boiler Installation
Book before starting.
2.1 With Hearth
A fireproof hearth under the fire front must have the
minimum dimensions as shown in diagram 2.1.
2.2 With Surround
See diagram 2.2. The fire front casing should cover the
opening.
A wider opening will require any opening left to be
covered with a non-combustible finished material, see
diagram 2.3.
The surround must have a minimum clear, flat area as
shown in diagram 1.2. Any projection on the surround
must be outside this area.
Any combustible material on the fire front fixing face
area of the surround must be removed, see diagram 2.3.
This area, to the depth removed, should then be rendered
with a sand/cement mixture.
2.3 Without Surround or Hearth
The fire front fixing wall face must be flat over an area
as shown in diagram 1.2. This also shows the minimum
clearances for shelves or projections on the fire front
fixing wall face.
The information in the last two paragraphs of “With
Surround” should now be followed.
Under no account must carpet or other combustible
material be laid directly under the fire front, unless the
minimum clearances shown in diagram 1.2 is achieved.
The dimension is taken from the bottom of the fire front
plinth to the top of the carpet pile or other floor covering.
2.4 Flue
The back boiler flue collector assembly accepts the fire
front flue spigot.
Note: Provision must be made during the installation of
the back boiler for total ventilation requirement for the
combined appliance. See relevant section in back boiler
installation instructions.