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2.2.2 PRE-CAST FLUE OF MINIMUM SIZE (Fig. 2)
This fire can be installed into a properly constructed pre-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 305mm. The
fireplace opening height must be between a maximum of
585mm and a minimum 560mm and a depth of at least
120mm above the hearth level.
NOTES:
1. The minimum dimensions for the flat area around the
opening are 686 mm high x 635 mm wide.
2. The flue spigot restrictor MUST NOT be fitted.
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
raked portions.
CHECK THE FLUE FOR GOOD DRAUGHT AS DETAILED
IN SECTION 2.2.1.
5
Fig. 2
PRECAST FLUE INSTALLATION
63
5 MI
N
*63
5 MI
N
*
615 MAX
560 MIN
615 MAX
560 MIN
45
7
MAX
3
05
MIN
45
7
MAX
3
05
MIN
12
0mm
MI
N
12
0mm
MI
N
686 MIN*686 MIN*