The EFIS - CoPlasma system
1.2. Electrofiltration
1.2. Negative Air Ionization
2.1. Central Air Conditioning or Purification Systems
2.2. Local & Plug-in Play Air Purification Systems
1. EFIS – CoPlasma: Concept description
The EFIS - CoPlasma system is a unique & patented concept for air purification, sterilisation and revitalization. It combines the electrofiltration and the negative air ionization technologies.
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the Electrofiltration, instead of mechanical filters, has the capacity to abate very fine particles down to 0.1µm, to kill the micro-organisms in the air and to generate the microconcentration ozone
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the Negative Air Ions Generators (NAIGs) generate high concentrations of Negative Air Ions (NAIs), what revitalizes the ambient air
Electro-filtration is a well established 2 steps particle abatement system for separating very fine particles and aerosols as small as 0.1µm.
The first step consists in positively ionising the contaminating particles at around 6 to 12kV, via stainless steel wires or dentate plates
The ionisation step of the electrofilter produces a micro-concentration of ozone, below the norms (100ppb), that will instantly reacts with negative air ions, so forming a “CoPlasma”, that has a bactericidal effect on micro-organisms.
The second step consists in forcing the ionised particles to flow between aluminium or stainless steel plates, alternatively grounded or positively charged. When a positively charged particle flows between 2 plates, the positively charged plate repels the positively charged particles on the grounded plate.
Regarding particle abatement efficiency:
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a single stage electrofilter has the efficiency of an F9 filter
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a double stage electrofilter has the efficiency of an HEPA H13 absolute filter
Advantages of electrofiltration compared to mechanical filters:
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Lower pressure drop => lower fan power => more economical and silent system
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No pressure drop increase with time
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efficient micro-organisms and viruses abatement via particle filtration & electrocution of micro-organisms entrapped in water aerosols
1.2. Negative Air Ionization
High concentrations of negative air ions are produced by Negative Air Ion Generators (NAIG), consisting in gold coated needles blowing electrons in the electrofiltered air, that will instantly bind on oxygen molecules, so forming negative air ions (NAIs)

2. Air Purification Technologies designed with the "EFIS-CoPlasma" Concept
The EFIS-CoPlasma concept can be integrated in various systems.
2.1. Central Air Purification or Conditioning Systems

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Very high particle abatement efficiency (ISO 8 up to ISO 7) without mechanical filter
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Micro-organism control in the air handling unit and the downstream ducts
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healthy NAIs concentration in the ambience
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little system maintenance
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- no spare parts, except the needles that have to be replaced once a year
- low pressure drop - no pressure drop increase - low energy consumption
- can be integrated in classical air conditioning systems
more info
2.2. Local Air Purification Systems, autonomous & Plug-in Play
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Wide range of different models & sizes
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Very high particle abatement efficiency (ISO 8 up to ISO 7) without mechanical filter
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Micro-organism control in the air handling unit
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healthy NAIs concentration in the ambience
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little system maintenance
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no spare parts, except the needles that have to be replaced once a year
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low pressure drop - no pressure drop increase - low energy consumption
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Plug in Play – working with 220V
3. Validations
3.1. Validations on micro-organisms in laboratories
3.2. Validations in the health sector
3.3. Validations in the tertiary sector
3.4. Validations in the food industry
3.5. Validations in the electronic industry
3.1. Validations on micro-organisms in laboratories
In laboratories, Petri plates have been contaminated with different strains like Staphylococcus aureus, E. Coli, Legionella, Lysteria, Mucor, Penicillium,… and set in parallel in incubators or cold rooms, either treated with or without the CoPlasma effect.
For some strains, like Lysteria and Legionella, drastic abatements have been obtained after just a couple of hours.
For fungi like Penicillium, the CoPlasma effect inhibits the sporulation of its spores.
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Lysteria (t=0) Lysteria (t=8h)
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sporulation inhibition after 24h
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Penicillium spore Penicillium spore
(t=0) (t=24h) |
3.2. Validations in the health sector
In 1999, at the San Matteo hospital (
Pavia , I), the EFIS-CoPlasma system has been installed in an air duct leading to an operation chamber after an F7 filter and before an HEPA filter. The validation results are reported below:

Abatement higher than 99.9% for particles larger than 0.3µm
Bacteria abatement:
Abatement closed to 100% for micro-organisms in the air and on the duct surface
Since than, several EFIS CoPlasma systems have been installed in Italian hospitals and private practices.
3.3 Validations in the tertiary sector
The EFIS CoPlasma has been tested at the “Institut für Lufthygiene” (
Berlin , D) on bacteria (Micrococcus Luteus), fungi (natural spectrum in the air) and yeasts (Rhodotorula rubra).
The EFIS CoPlasma system has been integrated in a duct and has been challenged at different velocities and relative humidities. For each test, 3 measurements before and after the system have been performed.
Test |
V |
RH |
Contaminant |
Concentration |
Efficiency |
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(m/s) |
(%) |
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before |
after |
(%) |
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(cell/m3) |
(cell/m3) |
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1 |
2.6 |
60 |
A |
20086 |
46 |
99.77 |
2 |
2.6 |
60 |
B |
6239 |
n.d. |
> 99.96 |
3 |
2.6 |
60 |
C |
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> 99.96 |
4 |
2.6 |
60 |
Particle |
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99.48 |
5 |
4.6 |
90 |
A |
14710 |
48 |
99.67 |
6 |
4.6 |
90 |
B |
4133 |
n.d. |
> 99.96 |
7 |
4.6 |
90 |
C |
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98.35 |
8 |
4.6 |
90 |
Particle |
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98.24 |
A: |
bacteria: |
Micrococcus Luteus |
B: |
yeast: |
Rhodotorula rubra |
C: |
fungi: |
natural spectrum in the air |
The test report concludes that:
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the efficiency of the EFIS CoPlasma system matches the one of HEPA filters, type H12/H13
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for ISO6 down to ISO 3 class clean rooms, the EFIS CoPlasma can be used as single prefiltration system
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for ISO7 or higher class clean room, the EFIS CoPlasma can be used as such
3.4. Validations in the food industry
Production and filling rooms
In the food industry, the major risk of product contamination occurs via the air during the production and packaging process. If the air in contact with the product is pre-treated with the EFIS CoPlasma system, the risk of contamination is drastically reduced. The EFIS CoPlasma system has been successfully introduced in systems for packaging cheese, salad, meat,…
At the dairy company Alimentaria Molisdana (Campachiaro, I), in the production room at rest, the EFIS CoPlasma system has allowed to reach a class ISO 7 with less than 5CFU/m3 |
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Cold rooms & Ripening rooms
Fungi & bacteria growth in cold rooms and maturation rooms are difficult to control. If they are detrimental for the product, the EFIS-CoPlasma system can successfully abate them.
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The following picture shows 2 pieces of cheese that have matured at 15-17°C and 85% humidity during 6 days after inoculation of 15.000 spores of Mucor Javanicus; the piece on the left hand side has matured in a non treated maturation room and is covered with micro-organisms. On the right hand side, the piece has matured in a room treated with the HT-NS system and no spore growth has been noticed. Validation test performed by
CRN (Padova, I) and
Veneto Agricoltura (Thiene, I) |
Tests at the Hygiene Institute in
Parma (I) have shown that the EFIS-CoPlasma system has a positive impact on the organoleptic quality and the lifetime of fresh food products.
At the dairy company Alimentaria Molisana (Campachiaro, I), in the ripening room at rest, the EFIS CoPlasma system has allowed to reach a class ISO 7 with less than 5CFU/m3 |
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3.5. Validation in the electronic industry
Fine airborne particles have dramatic consequences on the electronic product quality if their surfaces are not electrically neutralized. Negative air ions are able to electrically neutralize these surfaces. The EFIS-CoPlasma system introduced in a Nokia mobile phone manufacturing plant has helped to prevent 18% product waste.
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