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2.12 Connection to separate pipes
The separate Ø60 pipes for air intake and flue gas exhaust can be connected directly to the boiler, as shown
in Fig. 16a. Separate Ø80 pipes can be connected directly, once the two 80/60 (optional) reducers have been
fitted inside the boiler (Fig. 16b).
Flue
Air
Ø60
Ø60
Fig. 16 a
Upon request, a wide range of pipes, bends and accessories can be supplied. For the various components,
refer to tables 1-2-3 or to the flue accessory catalogue.
A simple calculation can be performed to ensure that the maximum allowable pipe length is not exceeded:
1 For each component, table 1-2-3 lists the loss of pressure in "equivalent air-metres", depending on
the position of installation of the component itself (air intake or flue gas exhaust, vertical or
horizontal).
The loss is called "equivalent air-metres" as it relates to the loss of a metre of air intake pipe (defined
as being equal to 1). For example, a 90° Ø80 bend in flue gas exhaust has a loss equivalent to 2.5
air-metres, that is equal to 2.5 linear metres of air intake pipe.
2 Once having completely defined the layout of the double flue system, add the losses in equivalent-
metres, according to the position of installation of all the components and accessories in the system
3 Check that the total loss calculated is less than or equal to 100 equivalent metres, that is the maximum
allowable for this model of boiler.
If the flue system chosen exceeds maximum allowable limit, some sections of the pipes should be
larger in diameter.
20
Ø80
Ø80
Fig. 16 b
ARENA 30 A
Flue
Air
Ø80
Ø80
Fig. 16 c
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