5.10.4
Metal flue box.
The appliance can be installed to a metal flue box conforming to BS715 with a
minimum internal depth of 200mm. Incombustible mineral wool insulation of not less
than 50mm thickness must be applied to the top surface of the firebox and it must
stand on a non combustible hearth. There must be an air gap clearance of 50mm all
round the outside of the box and above the top insulation to any combustible material.
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
623mm (Inclusive of sealing tape) will leave the sealing tape and closure plate visible
above the appliance.
** This fire has been tested for use on the ‘Rite-Vent’ 7T95125 metal flue box and
found to be satisfactory.
5.11 Flues.
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 1806, BS EN 1858 or
B.S 1289.
A flue pipe with a minimum diameter of 127mm. See BS EN 15287-1 for suitable
materials. Metal flue pipes must comply with BS EN 1856 part 1. See section
5.10.4 of this guide for flue box opening sizes.
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 B, the minimum
equivalent
height of the
flue shall be 2.0m of 125mm dia. flue pipe.
The flue must be clear of any obstruction and its base must be clear of debris.
The flue must be completely sealed so that combustion products do not come into
contact with combustible materials outside the chimney.
The flue must serve only one fireplace.
Proprietary terminals must comply with BS EN 1858, BS EN 1806 or BS 1289 and
older versions of BS 715. Any terminal or termination must be positioned in
accordance with BS 5440 Part 1 to ensure that the products of combustion can be
Page 16
INSTALLER GUIDE
©
Baxi Heating U.K. Limited 2010.
Width
Height
Max.
432mm
Min.
407mm
Max.
610mm*
Min.
560mm**
