4.10.2 Metal flue box and hearth.
The appliance can be installed to a fireplace incorporating a twin wall metal flue box
complying with the constructional requirements of the current edition of
BS 715 and with a flue conforming to BS EN 1856 part 1. The dimensions of the flue
box must conform to those shown in figure 7.
The top surface of the metal flue box and the upper 200mm of the sides and rear
faces must be covered with a 50mm layer of mineral wool or equivalent insulation
(See figure 7).
Important Note: Where the flue box has a base sheet that is single wall (i.e. a single
metal sheet) the flue box must be mounted on a non-combustible hearth. The hearth
material must be at least 12mm thick.
Page 17
© Baxi Heating U.K. Limited 2010.
INSTALLER GUIDE
Figure 7. Metal flue box
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