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4
221100C
1553
2555
2451
PREPARED
BASE
100mm
MIN
450mm
MIN
560mm MIN
to
590mm MAX
INSTALLATION CENTRE LINE
Diagram 2.2
706mm
MIN
50mm
MIN
300mm MIN
CORNER
IN-FILL
(not required
to be full
depth of
opening
13mm MIN
NON- COMBUSTIBLE
MATERIAL
C
L
PREPARED
BASE
REMOVE
COMBUSTIBLE
MATERIAL FROM
THIS AREA
135mm
750mm
270mm
270mm
BUILDERS
OPENING
INSTALLATION
CENTRE
LINE
Diagram 2.3
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.
Any greater opening will require corner infill.
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 2.2.
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” above 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 have been made during
installation of the back boiler for total ventilation
requirement for the combined appliance. See relevant
section in Back Boiler Installation and Servicing
Instructions.
510mm
to
580mm
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 2.1