The environmental air is
forced into the mixing unit. A proportion of 70% of recycle air is re-introduced after
mixing with a proportion of 30% of external air. The same percentage of recycle air is
ejected. 
A
mechanical filter purifies the air from visible particles and a high-efficiency
electrostatic filter provides for the filtration of the microscopical particles with
an efficiency of 99% (to 0,01- µm particles).
The purified
air is carried to the air conditioning unit, either of the direct expantion type or water
working type, which betters the air characteristics in terms of humidity and temperature.
In the pipeline
which carries the treated air to the openings, the system autonomously provides to keep
the bacteria on an almost inexistent activity level. This is possible because a high and
constant ion concentration is generated by one or more electrode, as to create
the chemical-physical conditions which avoid the formation of mould, bacteria and viruses.
In the last part
of the pipeline a neutralizing element eliminates the ionic charges present in high
concentration.
During the emission phase into the environment, a special emitter electrode cannon
re-establishes the natural ionic balance of the air. In this way it creates the ideal
conditions of well-being.
