3.6 Plastic (PPs) flue pipe for routing through a shaft with open flue operation (type B to
TRÖI 2009)
Open flue operation requires a flue pipe as the connection piece
between the Vitoladens and the shaft as well as for the routing through
the shaft.
The installation room must provide a ventilation air aperture with
an unrestricted cross-section of at least 150 cm
2
or 2 × 75 cm
2
.
Internal flue diameter: Ø 60 or 80 mm
The flue system is connected to the boiler flue connection.
The combustion air is drawn from the installation room via the annular
gap in the boiler flue connection.
For installation through shafts or channels with longitudinal ventilation
meeting the requirements for domestic chimney stacks to DIN V
18160-1, or with a fire rating of 90 minutes (L90), or a fire rating of 30
minutes (L30) for buildings in categories 1 and 2.
Prior to installation, the flue gas inspector should check that the shaft
to be used is suitable and approved for this purpose.
Shafts that were previously connected to oil or solid fuel boilers must
be thoroughly cleaned by a chimney sweep. Loose deposits (in par-
ticular sulphur and soot deposits) must not remain on the inside of the
chimney.
Close off and seal any other connection apertures with appropriate
materials.
This does not apply to any cleaning or inspection apertures that are
provided with chimney cleaning covers and that are identified with an
appropriate test mark.
Check prior to installation whether the shaft runs straight from top to
bottom or if it is corbelled (check with mirrors).
If it is corbelled, we recommend the installation of a flexible flue pipe
(see page 36).
The local flue gas inspector should check the system for tightness prior
to commissioning (where applicable).
In the case of open flue operation, this can only be done by means of
a pressure test.
Inside the installation room, at least one inspection port must be pro-
vided in the flue system for checking and cleaning as well as for check-
ing the pressure.
If the flue pipe is inaccessible from the roof, a second inspection port
must be provided in the attic behind the chimney cleaning hatch.
Safeguard the draining of the condensate from the flue pipe to the
boiler with a fall of at least 3º.
Route the flue system to above the roof (observe the roof protrusion
parallel to the roof inclination according to local regulations).
Alternative flue pipes with Building Regulation approval may be used,
for example, if a larger pipe diameter is required because of greater
flue length. In that case, the performance verification to EN 13384
should be provided by the relevant flue pipe manufacturer.
Internal shaft dimensions
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