Installation Depth Requirements for a Gallery Slimline Open Fronted Radiant
Gas Fire being installed into a brick built chimney, requiring 12.0 litres of
debris collection volume (fig. 2)
There must be a minimum depth of 135mm in the chimney to allow a debris
collection volume of 12 litres to be achieved.
Fig. 2
1.7 FITTING TO PRE-FABRICATED TWIN WALL METAL FLUE BOXES
The appliance may be fitted to twin wall metal flue boxes conforming to the
constructional requirements of BS 715 / BS EN 1856-2. The box must have a
minimum flue diameter of 125mm internal and minimum internal dimensions of
300mm deep by 685mm high by 470mm wide. There are no maximum
dimensional requirements for the box. The top face of the box must be insulated
with a minimum thickness of 50mm of non-combustible mineral wool insulation or
similar material. The flue box must stand on a non-combustible base of minimum
thickness 12mm.
7
Depth Required
(e.g. 135mm
minimum)
Builders Opening
