The main task of air ducts cleaning is to remove visible contamination such as dust, garbage and moisture from the systems of supply and exhaust ventilation in such a way that the air going through the ventilation system will not go in contact with contaminated surfaces. Organisms that can not always be detected with the naked eye, such as mites, bacteria and fungi, are also removed by cleaning an
d subsequent disinfection of the ventilation system. Microorganisms rarely occur in ventilation systems, but people should pay a particular attention to them, since they may affect the climate and cause various diseases to people in the room. Contaminations in the air ducts may be in the loose condition, or may be bound by fatty deposits. Unconsolidated sediments are usually found in the air ducts used for fresh air. Mainly it is dust, pollen from trees, etc. Two types of pollution may be situated in the exhaust duct. For example, on the food and to***co production, the tea-packing factories, pollution is usually a loose structure that is easily removed by vacuum cleaning systems and machines. In the confectionery industries, kitchens and restaurants, the pollution is often associated with fat deposits, and for their cleaning it is necessary to use more sophisticated methods and installation.
