Incombustible mineral wool insulation of not less than 50mm thickness must be
applied to the top surface of the metal flue box.
The opening must be within the following dimensions:
*
The total height of the closure plate is 660mm and will accommodate a maximum
opening height of 650mm (This allows a 10mm overhang). Heights above
620mm (Inclusive of sealing tape) will leave the sealing tape and closure plate visible
above the appliance.
4.12 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 BS EN 1858 or BS 1289.
A flue pipe with a minimum diameter of 127mm. See BS 6461 Part 1 for suitable
materials. Metal flue pipes must comply with BS EN 1856. See section 4.11.5 of this
guide for flue box opening sizes.
4.12.1 The flue must conform to BS 5440: Part 1 in design and installation.
The flue, measured from the bottom of the fireplace opening to the bottom of the
terminal, shall be not less than 3m in actual vertical height. When calculated in
accordance with BS 5440: Part 1 Annex A, the minimum equivalent height of the flue
shall be 2.0m of 125mm dia. flue pipe.
4.12.2 The flue must be clear of any obstruction and its base must be clear of
debris.
4.12.3 The flue must be completely sealed so that combustion products do not come
into contact with combustible materials outside the chimney.
4.12.4 The flue must serve only one fireplace.
4.12.5 Proprietary terminals must comply with BS EN 1858, BS EN 1806 or BS
1289. Any terminal or termination must be positioned in accordance with BS 5440
Part 1 to ensure that the products of combustion can be safely dispersed into the
outside atmosphere. Where the appliance is connected to an unlined brick chimney it
is generally unnecessary for the chimney pot to be replaced or for a terminal to be
fitted unless the flue has a diameter smaller than 170mm.
4.13 If the fireplace opening is an underfloor draught type, it must be sealed to
stop any draughts.
4.14 The flue spigot and any spigot extension must be capable of passing through
the closure plate by at least 15mm with a minimum clearance of 50mm between its
Width Height
Max. 440mm
Min. 380mm
Max. 610mm
*
Min. 525mm
INSTALLER GUIDE
© Baxi Heating U.K. Limited 2008.
Page 13
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