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Air Conditioning
UV-C germicidal Emitters are installed in the AHU in frontor after the cooling coil and above the drain pan. This location provides more effective biofilm and microbial control than in-duct UVC installations. By irradiating the contaminants at the source – the cooling coils and drains pans – Steril-Aire UVC delivers simultaneous cleaning of surface microorganisms and destruction of airborne microorganisms.
Treating air that passes through an HVAC unit with ultraviolet light will reduce, or eliminate, DNA-based airborne contaminants (bacteria, viruses, mold spores, yeast, protozoa), and provide much healthier air to breathe. UVC Germicidal Fixtures are a labor-free solution that will not harm occupants, equipment or furnishings because they produce no ozone or secondary contaminants. For more than 70 years, tens of thousands have been safely installed in hospitals, clinics, processing plants, commercial offices, manufacturing sites and other commercial facilities and multi-and single-family residences around the world. 

Filters and Coil Cleaning 

Filters are necessary to trap dust, pollen and other particles, however, to remove harmful bacteria and viruses from the air stream you need the addition of UVC light to render these microorganisms sterile, and therefore unable to reproduce. 
Cleaning coils is like treating symptoms. Using UVC Germicidal Fixtures on the other hand, is actually more like curing the disease. 
Without UVC, coils require constant cleaning, an expensive and inferior process that often relies on toxic and/or flammable solvents that are dangerous, and that can diminish the life of the coil. Cleaning also frequently leaves material embedded in the center of the fin pack. Steam cleaning, in particular, can actually force growth deeper into the fin pack, compressing it so tightly that the only solution could be to replace the coil. 
Financial Benefits

UVC Germicidal Fixtures keep coils clean all of the time, enabling HVAC systems to perform as originally intended, and ensuring: 
System efficiency 
Longer equipment life 
Lower energy and maintenance costs 

They'll often pay for themselves in months and can help you save many thousands of Rands in on-going energy and maintenance costs. In addition, UVC Germicidal Fixtures play a very important role in improving air quality and will eliminate the awful odour and slimy build up associated with mould and bacteria that thrive when temperatures are between 10 - 38 C (especially when moisture is present), and that make air unhealthy for all building and residential occupants. Healthier employees mean better productivity and less sick time.
ASHRAE Validates Use of Ultraviolet Light Technology 
Ultraviolet disinfection technology has continued to grow in various industries over the past few decades one particular segment, HVAC and Building Maintenance, has seen surges in UV installations and use more recently. As this industry continues to implement UV more and more; there has been a push for more and more organizations to research and recommend the technology. One such group that has recently done this is ASHRAE. 
ASHRAE is highly regarded in the HVAC and Building Maintenance industry for its standards on indoor air quality among as well as the maintenance of efficiency in the use of equipment in the heating and cooling as well as the refrigeration segments. You might recall from our previous post on the AHR Expo that ASHRAE stands for the American Society of Heating, Refrigerating and Air Condition Engineers_ the global society focuses solely on building systems, energy efficiency, indoor air quality, and refrigeration. The group promotes standards and best practices for the technology in industries that utilize these segments, as well as tries to education both industry members and consumers on current events and technologies available.