IHL_UDARA_2016_11_04_BEGB
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4.5.3
Installation of the readmission ducts
Attention!
Always install the readmission ducts in such a way
that noise locks cannot occur between different
rooms.
A range of white acoustic insulated air distribution
boxes (plenums) are available for Udara appliances to
which the readmission ducts can be connected. The
box is installed at the bottom with regard to the up
fl
ow
version and on top of the appliance with regard to the
down
fl
ow version. The readmission ducts can also be
connected directly on to the side of the air heater if
required. Please order the optional
fi
lter cartridge for a
side connection to do this.
The standard side
fi
lter frame for the Udara 40 and 50
is very small and we recommend using a long tool life
fi
lter from the range of accessories.
If you want to use an open return (only possible if there
are no appliances with an open combustion circuit in
the set-up room), you can order a perforated readmis-
sion plenum.
f you are connecting an outdoor air duct, a control
valve must always be included in the outdoor air duct.
4.5.4
Air distribution box dimensions
Danger!
• Internal acoustic or thermal insulation in the air
distribution box must be able to resist long-
term increased temperatures and must be
mechanically protected against being
detached.
• The insulation must be erosion-proof so that no
dust particles end up in the air
fl
ow.
Use the
fi
gures below as a guideline when determining
the ideal size of the air distribution boxes and/or air
ducts. Please contact us for advice if you have any
doubts or questions.
A
1
30° max
A
A
½ A
1
30° max
Legend
Number
Meaning
1
Acoustic and thermal insulation
A
Width of the appliance
