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INSTALLER’S GUIDE
Page 9
standards. The flue blocks must have a minimum width not less than 63mm and a cross-
sectional area not less than 13,000mm
2
.
Older editions of BS1289 required a cross-
sectional area of 13,000mm
2
. The current revision of the standard requires 16,500mm
2
.
This appliance is suitable in both cases.
The chimney should be one or two storeys high but not less than 3m vertical height and
be correctly terminated. No mortar fangs between the blocks should be extruded into the
flueway. If raking blocks are used, they must be fitted in accordance with the
manufacturer’s instructions. Mortar must not be allowed to drop down and accumulate in
the raked positions.
The fireplace opening must be within the following dimensions:
Width
Max.
440mm
Min.
305mm
Height
Max.
610mm
1
Min.
525mm
2
1
Though the total height of the closure plate will accommodate a maximum opening
height of 650mm, heights above 610mm will leave the closure plate and sealing tape
visible above the appliance.
2
Any opening visible below the appliance may be closed in.
4.9.4
Metal Flue Box
The appliance can be installed to a metal flue box conforming to BS715 Section 6 (For
gas fires to BS5258: Part 5) having a minimum internal depth of 165mm.
The opening must be within the following dimensions:
Width
Max.
440mm
Min.
380mm
Height
Max.
610mm
★
Min.
525mm
★
Though the total height of the closure plate will accommodate a maximum opening
height of 650mm, heights above 610mm will leave the closure plate and sealing tape
visible above the appliance.
4.10
The following flues are suitable:
•
225mm x 225mm conventional brick flue.
If a flue liner is used, it must be a minimum of 125mm diameter. The liner must be sealed
to the surrounding area above the fireplace opening and to the top of the chimney. An
approved terminal must be fitted.
•
A properly constructed precast flue conforming to B.S 1289 or BS EN 1806.
•
A flue pipe with a minimum diameter of 127mm. See B.S 6461 Part 1 for suitable
materials. Metal flue pipes must comply with B.S 715. See section 4.9.4 of this guide for
flue box opening sizes.
4.10.1
The flue must conform to BS 5440: Part 1 in design and installation.