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Flue systems
6 720 645 817 (2010/09)
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11 Flue systems
11.1 Flue system
11.1.1 Requirements
Standards, regulations and directives
Flues must be resistant to moisture, flue gas and
corrosive condensate. They must comply with the
applicable technical rules and local regulations.
General information
Use only flues that conform to building regulations.
Observe the requirements in the approval notice.
Size the flue system correctly (essential for correct
function and safe boiler operation).
Design the ventilated cross-section between the
chimney shaft and the flue so it can be inspected.
Install flues so they can be replaced.
Provide secondary ventilation for flues that operate
with positive pressure.
In the case of a circular flue in a rectangular chimney
shaft, ensure a clearance between flue and chimney
shaft walls of at least 2 cm; in the case of a circular
flue in a circular chimney shaft, at least 3 cm.
The flue system is sized in accordance with
DIN-EN 13384-1 for single connections and to
DIN-EN 13384-2 for multiple connections.
Install the horizontal part of the flue with a fall of 3°
towards the boiler and secure so it cannot slip out of
the boiler flue outlet, particularly with the larger
dimensions from DN 200 (e.g. use a support).
Material requirements
The flue material must be resistant to the flue gas
temperatures that can occur. It must be resistant against
moisture and acidic condensate. Stainless steel and
plastic flues are suitable.
Flues are split into categories according to their
maximum flue gas temperature (80 °C, 120 °C,
160 °C and 200 °C). The flue gas temperature can be
below 40 °C. Moisture-resistant chimneys must
therefore also be suitable for temperatures below
40 °C.
Generally, protection should be provided by a high
limit safety cut-out when a heat source is combined
with a flue designed for low flue gas temperatures.
This requirement can be ignored as the boiler and
burner control units of the Suprapur gas condensing
boiler incorporate the function of a flue gas
temperature limiter. This prevents the maximum
permissible flue gas temperature of 120 °C for
category B flues being exceeded.
Positive pressure is likely to occur inside the flue
system since condensing boilers operate with
positive pressure. If the flue system is routed through
occupied rooms, install it in a chimney shaft with
secondary ventilation along the entire length. The
chimney shaft must be compliant with relevant local
fire regulations.
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