Fondital NIAS BTN 28, Installation, Use And Maintenance Manual

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3.2.7 Flue system configuration
C12
Boiler connected to horizontal
air intake and outlet ducts directly into
the atmosphere using coaxial or split
ducts.
The distance between the air intake
duct and the flue gas outlet duct must
be at least 250 mm (see pic. 15) and
both end sections must be located
within a 500 by 500 mm surface area.
C32
Boiler connected to vertical
air intake and outlet ducts directly into
the atmosphere using coaxial or split
ducts.
The distance between the air intake
duct and the flue gas outlet duct must
be at least 250 mm (see pic. 15) and
both end sections must be located
within a 500 by 500 mm surface area.
C42
Boiler connected to collective
chimneys including two ducts, one for
the air intake for combustion and the
other for the discharge of the
combustion products, through coaxial
or split ducts.
The chimney must comply with
applicable law provisions.
C52
Boiler connected to separate
combustion air intake and outlet
ducts.
These ducts can discharge into
areas at different pressure values.
Split ducts external terminals must
not be located on two directly
facing walls.
C82
Boiler connected to a duct for
conveying combustion air and an
individual or collective chimney for
discharging the flue gas.
The chimney must comply with
applicable law provisions.
Type
C12
Type
C32
Type
C42
Type
C52
Type
C82