INSTALLER GUIDE
Page 11
©
Baxi Heating U.K. Limited 2008.
4.3
Suitable flues and minimum
flue sizes are as follows: -
It should be noted that, as with
many appliances, sharp bends or
horizontal runs in metal flues at the
top of the system can be a cause
of problems in these types of
installation.
225mm x 225mm conventional
brick flue.
175mm diameter lined brick or
stone flue.
200mm diameter factory made
insulated flue manufactured to
BS4543 Part 2.
175mm diameter flue pipe. See
BS6461 Part 1 for suitable
materials.
Single wall, twin wall or flexible
flue liner with a minimum diameter
of 125mm. The materials to be
used are stainless steel or
aluminium as specified in
BS EN 1856 Part 1. 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
concrete or clay flue system conforming to BS1289 or BS EN 1858. This system is
only suitable if the conditions stated in section 4.2.3 are met.
4.4
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.
4.5
The flue must not be used for any other appliance or application.
4.6
Any chimney damper or restrictor should be removed. If removal is not possible,
they must be secured in the open position.
Figure 3. Precast or clay flue block system
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