Air filtration device

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Air filtration device

The Crystall Duct System is an innovative filtering system to be fitted on air outlets or inside ducting. It is made up of three main elements: 
a) patented electronic plate filter ("Femec") 
b) electronic control and power board 
c) high voltage flexible connection cable 
The system has been designed to reduce the spread, indoors, of various types of pollutants found in the ducting of air-conditioning systems. As a result, it is ideal for various types of environments, such as schools, hospitals and rest homes (corridors, waiting rooms, wards), doctorsÂ’ surgeries, hotels and anywhere indoor air quality needs to be improved. 

Further info from manufacturer on CRYSTALL DUCT SYSTEM
Further details
The Crystall Duct System is consequently an effective, reliable and simple product. Furthermore, it has extremely low maintenance costs: it never needs replacing and can be washed and sanitised using ordinary detergents, without any decline in efficiency or product life.

The dimensions are perfectly adaptable to the most common and standard shapes of the outlets and diffusers currently available on the market.

The filtering units can also be installed on existing systems, without having to significantly change the characteristics of the system.

The filtering units can also be installed on existing systems, without having to significantly change the characteristics of the system.
The electronic filtering units always have a slight additional pressure drop over normal outlets, which must be taken into consideration by the designer and the installer.

Two types of system solutions are available:
a) filtering unit combined with outlets and/or diffusers (electronic terminal filter)
b) filtering unit installed in a section of ducting (duct-mounted electronic filter)

A series of electronic terminal filters can be powered and controlled by just one electronic control unit, located as desired by the installer. The filters are connected together by a simple electrical connection.

When the filters become saturated by pollutants or if there is a malfunction in one of the filters, a signal is sent by the control unit (on/off), which can be connected to a light and/or audible device, as preferred by the user.

Electrical safety is ensured by special protection features on each filtering unit, which prevent accidental contact with live parts if the filter is removed without first disconnecting the power supply.

The electronic filter is removed for periodical cleaning at scheduled intervals, which vary according to the type and the age of the installation. In addition, the maintenance operations do not require the installation to be shutdown if a set of spare filters is used (in practice, a set of special low-cost extruded aluminium sections).

Advantages of the Crystall Duct System
Installation possible on existing systems
Low impact on the thermal and aeraulic equilibrium of the installation
Reduced pressure drop even when the filter is dirty
Significant bactericide action on biological pollutants
No cost for replacing the (the filters are totally regenerable by simply washing them)
Very low additional energy costs
Simple and fast maintenance
No system downtime for the maintenance of the filtering units
Remote power supply that can power multiple filtering units at the same time

Tests and certification
The Crystall Duct System has been the subject of numerous trials and efficiency and effectiveness tests to assess the functions and performance of the systems in real conditions.

The University of Ancona carried out over 180 laboratory tests on microbiological substances (total airborne microbiological load), including bacteria, mould, fungi, etc., which confirmed, through the statistical analysis of the data taken from the Fischer test, the effectiveness of the Crystall electronic filter in reducing the bacterial load.

Other tests have been carried out in the SABIANA laboratories on the flow-rate, pressure drop, electrical safety and instrumental efficiency of the filtration process on micro-particles by numerically counting the most common particle size categories in various rooms. The particles monitored had the diameters specified by the WHO (World Health Organization) and the EPA (Environmental Protection Agency) as being the most harmful to our health (<2.5 micron PM 2.5), with volumetric counts (number/m3) being performed in a common living environment, using a laser particle counter (LPC).
The problem of indoor air quality (IAQ) is at the centre of international attention and a current topic of discussion due to the implicit repercussions on the socio-sanitary situation in each country. Numerous studies and research carried out all over the world have in fact highlighted that all common environments contain a multitude of pollutants that are harmful to the health of the occupants.

These airborne pollutants are produced by the increasingly widespread use of new products for construction and furniture. In addition, in large cities, traffic, home combustion appliances, the use of chemical products for cleaning, the type of room and the characteristics of the site, inadequate ventilation, tobacco smoke and other causes represent important factors in the decline of indoor air quality.

In response to these facts, special attention has been paid to this important topic in recent years all over the world. This increased sensitivity has, through control of emissions and establishing maximum admissible concentrations, led to a significant reduction of some contaminants in the atmosphere, above all those of industrial origin, and a perceptible reversal in the trends of some related illnesses.

In addition, together with the relative reduction of outdoor pollution, recent years have seen the international medical-scientific community engaged in the public health sector take a stand on the problem of contamination of the air in indoor spaces. In general, indoor pollution is defined as the "presence of physical, chemical and biological contaminants in the air that would not naturally be found in air in high quality outdoor ecological systems" (Italian Environment Ministry, 1991).

The main source of exposure for some airborne pollutants and the only source for others is therefore represented by the level of indoor contamination.

Naturally, the composition of the atmosphere (nitrogen, oxygen, etc.) is the same outdoors and indoors, however the quality and the quantity of contaminants found indoors may differ significantly. The problem becomes even more important if we consider that some groups of people are much more sensitive to atmospheric pollution (the elderly, children, asthmatics, people suffering from bronchitis, emphysema, and illnesses in general, etc.) who, as well as spending most of their time indoors, have weakened natural defences to combat the harmful actions of some pollutants found in the air they breathe.

Since 1995, most Sabiana fan coils have been available with an innovative active electronic filter, called Crystall, which reduces the levels of many pollutants in the air, such as tobacco smoke, dust and fibres, and microbiological substances such as bacteria and fungi that are harmful to the health. The subject of numerous scientific publications, the Crystall filter has proven to be especially effective in reducing the spread of microbiological substances through air distribution ducts, and as a result is also currently available in the Crystall Duct System and Crystall Flex System version.

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