nilan Combi S 302 Polar Top Installation Instructions Manual page 29

Ventilation installation
Duct system
Legislation
ATTENTION
All work must be carried out by qualified persons and in compliance with existing legislation and
regulations.
Ducts
There are two systems by which to lead air through the house.
Spiral ducts
The spiral ducts are made from metal and are cut to size using an angle grinder. They are then
connected using bends and manifolds and are fitted in accordance with the blueprint. The ducts are
typically laid on the tie beams and are fixed with perforated band or they are suspended using
suspension band. Avoid unnecessary bending of the ducts.
To prevent sound from being transmitted from room to room, you should install silencers for each
room.
The ducts must be insulated to prevent heat loss and condensation. In some cases this can be avoided if
the ducts are run through the general insulation or inside the climate screen.
NilAIR tubes
NilAIR tubes constitute a flexible system that is easy to install. You can easily cut the tubes to size with
a Stanley knife and then situate them in accordance with the blueprint without having to use bends and
manifolds. You install a manifold box after the unit and let the tubes run from the box out to the
individual rooms.
With NilAIR tubes you do not need to install silencers for every room, as there is no risk of sound
transmission.
If you lead the tubes outside the climate screen, they must be insulated to avoid heat loss and
condensation. This is simpler than using spiral ducts, as NilAIR tubes are easily led through ordinary
insulation.
NilAIR tubes are more flexible than spiral ducts and you can therefore run the tubes in places that are
unsuitable for ordinary spiral ducts.
Unit
Nilan recommends that you install a flexible connection between the unit and the duct system.
This is to avoid vibrations from the unit being transmitted to the duct system, but also to lighten future
services of the unit that will make it necessary to move the unit.
Nilan offers flexible Sound Flex tubes that provide a flexible connection between the unit and the duct
system, but also reduce the sound transmission from the unit to the duct system.
The Sound Flex tubes are insulated against condensation. It may, however, be necessary with further
insulation in order to comply with local requirements to insulation of duct systems.
Combi S 302 Polar Top (English) BY NILAN
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