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Instructions
Installing the duct system
Sound damping the duct system is a very impor-
tant element in achieving the general feeling that
you have the perfect indoor climate. The noise
in a ventilation system comes primarily from the
unit’s ventilators. This noise can be propagated
throughout the duct system and out into individ-
ual rooms unless there is proper sound damping.
It is therefore also very important that silencers
are positioned correctly in the duct system.
There are many methods of sound damping.
Unit
Fig. 1
Figure 1 shows a system where the silencer can
be positioned directly after the unit, before the
main duct branches out. In this case, the effect of
the sound damper is used on the entire system.
Unit
Fig. 2
Figure 2 shows a system where it is not possible
to position the silencer before branching, and it is
therefore necessary to use two silencers, one on
each side of the T-section, before branching to a
room.
As well as damping the noise from the ventila-
tors, it is important to ensure that noise does not
propagate from room to room, i.e. where noise
runs through the ventilation ducts from room to
room. To avoid this, install a small silencer on the
branch to the rooms that you want to damp.
For room-to-room sound damping, use SLU-100-
300 and SLU-125-300, depending on the dimen-
sion of the branch.
Roof terminals/wall grills and roof ducts are the
visible part of the ventilation system from the
outside. They should therefore always be adapted
to the architectural style of the house as far as
possible. We recommend positioning the termi-
nals at least 3 metres apart measured horizontally
or 1 metre apart measured vertically, always with
the discharge terminal at the top. We also recom-
mend placing terminals/grills on a north-facing
or east-facing surface in order to achieve the best
and most comfortable operation of the system.
Installation
If the roof terminal is installed on a tiled roof,
we recommend using a Lindab GISOL roof duct,
which is a pre-insulated duct, meaning that you
do not need to manually insulate up to the roof
surface.
We also recommend using Lindab SBG installa-
tion fittings and a Lindab MG membrane duct for
a correct finish against the subroof.
NOTE:
• Avoid positioning the discharge lower than the
top edge of the top window and closer than 1
metre to the nearest window.
1 m
3 m
3 m
6.5 Sound damping
of the duct
system
6.6 Roof terminals
21
VIEWA402