Product specifications

6.3 Flue terminal clearances.
The flue terminal must be sited with
minimum clearance distances as
specified in figure 3.
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. We do not recommend
terminal position A (Fig 3).
6.4 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
50mm/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.
Figure 3: Flue terminal locations
Depending upon the boiler location and flue configuration required,
two different flue systems are available for use with the Atmos Multi
boiler:-
 125/80mm concentric system up to a maximum equivalent
concentric length of 18m for 24kW, 14m for 32kW or 12m for
38kW. Note that the terminal has already been allowed.
 80mm twin pipe system which enables separate air intake and
flue pipes to be fitted to the appliance, allowing a combined
total equivalent flue length of 64m. Note that the terminal has
already been allowed.
The maximum equivalent flue length of the flue system must not be
exceeded. If exceeded the boiler will not malfunction but its heat-
output capacity will be reduced. The connected gas/air regulator will
however, always ensure optimum combustion is maintained.
Examples of various flueing options and configurations are given in
figure 4.
ATMOS MULTI Mk 2 version 2008
Page 13