5
Connecting Flue Pipe
APPLIANCE/CHIMNEY CONNECTION
Connection to the appliance can be made using Prima Smooth, Prima Plus or alternative
approved single wall connecting flue pipes, or ICS.
This must be done by using the appropriate appliance connector. When a single wall connecting
flue pipe is used to connect an appliance to the chimney, the lower end of the chimney section
must extend a minimum of 425mm below the ceiling. When connecting the appliance to the
flue pipe all joints between the flue pipes/appliance outlet must be securely caulked and sealed
with non asbestos rope (or suitable alternative) and fire cement on solid fuel appliances and
using the appropriate lip seal gasket in the case of condensing appliances.
Any flue pipe connection to the chimney MUST be made in the same room as the appliance.
CONNECTION TO DRAUGHT DIVERTER
Where the appliance features a draught diverter the connection should rise vertically from it
for at least 600mm before any change of direction (unless otherwise specified by the appliance
manufacturer). This is in accordance with the recommendations contained in BS 5440 Part 1
section 4.1.5.
CONNECTING FLUE PIPE DIAMETER
The chimney size should be as recommended by the appliance manufacturer. Where there
is a requirement for a flue diameter smaller than the appliance spigot, then the operational
requirements of the appliance and the configuration of the flue must satisfy the flue sizing
requirements of EN13384-1 for single appliances, and EN13384-2 for multi appliances.
DISTANCE TO COMBUSTIBLES
In accordance with building regulations, it is essential that the correct distance to combustible
material is maintained on connecting flue pipes. On solid fuel applications, where there is a risk
of soot fire, on unmeasured (NM) designated single wall product, this distance is 3 x ØInt of
the pipe, e.g. for Ø130mm the distance is 390mm and for Ø150mm the distance is 450mm to
combustibles on both painted and non painted variants. On measured (M) single wall or double
wall products this distance will be as declared by the chimney manufacturer. On ICS25, when
used as a connecting flue pipe, this distance has been measured and is set at 100mm.
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