Functional description
Decentralised supply and extract air units for room ven-
tilation, isothermal units that compensate for the heat
loss due to ventilation according to the technical data.
An EC centrifugal fan takes in the outdoor air which
then flows through the motorised shut-off damper and
the outdoor air filter. The outdoor air then flows through
the rotary heat recovery unit, which can be switched
off if it is more energy efficient. If necessary, the air is
heated by the heat exchanger before it is discharged
towards the ceiling with a high propulsive force.
The extract air first passes the extract air filter, then
flows through the heat recovery unit, the extract air
fan and the motorised shut-off damper before it is dis-
charged to the outside as exhaust air.
The supply air is discharged near the ceiling with a
medium velocity. The selected air outlet ensures good
overall room ventilation. Once the air reaches the oppo-
site wall, it moves downwards and eventually through
the entire space. By the time the airflow reaches the
occupied zone it has a very low velocity.
If the power fails, the outdoor air and exhaust air
dampers are closed to ensure fire protection and frost
protection and to avoid draughts. This is ensured by a
capacitor in each actuator.
Parts and function
Ventilation unit overview > Schematic illustration of the airflows
Decentralised ventilation units SCHOOLAIR-S-HV
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