Physical discomfort, irritation or dryness of the eyes, nose and throat, cough, nausea and respiratory and mental fatigue, memory disturbances, drowsiness, apathy, dizziness or stress problems are some of the health problems caused when people remain much time inside modern office buildings, due to contamination factors that may be specific to the same premises, stuffy or poorly functioning facilities air conditioning.
These factors may come from the characteristics of human activity, primarily as odors and smoke snuff, which causes discomfort, irritation and discomfort, as well as contaminants that may have the same outside air for ventilation.
Moreover, it seems that many new materials currently used in construction and furniture and decor, produce fumes that are slowly joining the indoor air, as in the case of paints, dyes, paints, adhesives, etc.
These air conditioners because of its enclosed spaces such as coils, condensate tanks, pipes Desagotes, etc., deprived of light at a stable temperature, moisture and dirt as nutrients can cause a process of putrefaction that becomes a broth ideal for the growth and proliferation of plant or animal organisms, consisting in pathogenic bacteria, fungi, yeast or virus culture.
Given this background, the World Health Organization (WHO) in 1982 has established that buildings with a percentage of more than 20% of people experiencing acute effects on health and wellbeing due to pollution levels, make a condition called Sick Building Syndrome (SBS).
It has been determined that dust is the main transporting agent of allergic substances, composed of a variety of organic and inorganic components, including fibers, mold spores, pollen grains, mold, insects and mites, produce symptoms ranging from mild irritation severe breathing problems that can arise even in chronic diseases.
Surge of all the above, the need Necessary for all building that has air conditioning installations involving air treatment, which by construction, extension tubes, activities that they develop and how many people occupy, to establish rules requiring periodic cleaning ducts, plus air conditioning.
As for the tasks could be considered Cleaning General Specifications for Commercial Air Conditioning Systems established by the NADCA (National Air Duct Cleaners Association) Standards.