5.5.4
Flue terminal clearances
The flue terminal must be sited with minimum
clearance distances as shown in the diagram.
A terminal guard must be fitted if the terminal
is sited less than 2m above ground level.
Where the flue terminates within 1m of a
plastic or painted gutter or within 500mm of
painted eaves, then protection should be
provided in the form of an aluminium shield at
least 1m in length, fitted to the underside of
the gutter or painted surface.
Please Note!
Due to the low flue gas temperature, 'pluming'
will occur at the flue terminal. Care should be
taken to ensure that the discharge plume will
not cause annoyance to the customer or
neighbours. It is generally recommended that
flues should discharge vertically at roof level.
In this position, pluming is not normally a
problem.
5.5.5
Flue system
The flue system must be installed in accordance with BS5440:1.
Horizontal flue pipe runs must always be installed with a minimum slope of
50 mm/metre towards the boiler. This will prevent condensation from
gathering in the flue pipe, and will also reduce the chance of icicles
forming over horizontal pipe ends in the Winter.
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