5.2.2PRE-CAST FLUEOF MINIMUMSIZE (Fig.4)
Thisfire canbe installedinto aproperly constructedpre-cast
flue conforming to B.S. 1289 : 1975 or B.S. 1289 : Part 1 :
1986 or B.S. 1289 : Part 2 : 1989 of at least 3 metres
effective height and having flueways of at least 198mm by
67mm or equivalent cross-sectional area with no dimension
less than 63mm. The fireplace opening width must be
between a maximum 457mm and a minimum 406mm. The
fireplace opening height must be between a maximum of
572mm and a minimum 550mm and a depth of at least
120mmabove thehearth level.
NOTES:
1. The minimum dimensions for the flat area around the
openingare 610mm highx 505mmwide.
2. Theflue spigotrestrictor MUSTNOT befitted.
Ensure that any mortar fangs between the blocks do not
protrude into the flueways and if raking blocks are used they
are fitted according to the manufacturers instructions and
mortar is not allowed to drop down and accumulate in the
rakedportions.
CHECK THE FLUE FOR GOOD DRAUGHT AS DETAILED
INSECTION 5.2.1.
NOTE:ONLY SUITABLE FORDRY LINEDWALLS
On pre-cast flue installations the walls must be dry lined
over the route of the flue. Dry lining is the use of
plasterboard with an air space between the wall and the
plaster board. Installation must not be made into pre-cast
flues that have plaster applied directly to the surface of the
wall i.e. wet lined, because experience has shown that in
some wet lined installations the lack of heat insulation
provided by plaster can cause the plaster to shrink or crack
and other decoration such as wallpaper to discolour or
detatchfrom the wall.
5.2.3REBATED SURROUNDINSTALLATION
When fitting the fire to a pre-cast flue it is possible to use a
152mm deep rebated surround. Two optional extras are
requiredas follows:-
PartNumber
ClosurePlate 989571
Spigot 989568
Fit the closure plate to the wall ensuring that a good seal is
made between the plate and the wall. The plate has been
designed to sit on the floor behind the rebated surround or
hearth. This will position the spigot opening at the correct
height for the spigot when using a 50mm high hearth. If your
hearthis ofa differentheight repositionaccordingly.
If using a concealed gas connection ensure it is installed
before fitting the closure plate. Knock-outs are provided for
gaspiping.
Fit the spigot to the rear of the fire using the four screws
provided in the screw pack. Refer to Figures 5 and 6.
Proceedas follows:-
Positionthe spigoton therear ofthe fire.
Screw from inside the canopy into the spigot. It is easiest to
starteach screwbefore tighteningfully.
DONOTFITTHE RESTRICTOR
PRE-CAST FLUE INSTALLATION
50mm MINIMUM (2in)
3
120mm MINIMUM (4 /i n)
4
9 9
Fig. 4
505 MIN*505 MIN*
572 MAX
550 MIN
572 MAX
550 MIN
457 MAX
406 MIN
457 MAX
406 MIN
120mm
MIN
120mm
MIN
610 MIN*610 MIN*
