Improving Indoor Air Quality with Ultraviolet-C light

  • 50% of sickness comes from poor indoor air quality
    (USA figures from US Environmental Protection Agency)
  • Good Indoor Air Quality (IAQ) increases productivity by 20%
    (Green Building Council)
  • UVC solutions can save up to 15% in energy costs.

Air Conditioning provides us with a comfortable working environment, where we believe we are breathing good clean air. However, there are many invisible pollutants in the air that we are often not aware of and the damage they are doing.

With the spread of Covid-19 around the globe, we have all become much more aware of the ease with which viruses transmit. The diagram below shows all the ways that viruses and bacteria can get into HVAC systems.


Image source:  Steril-Aire

The biggest cause of poor indoor air quality is Biofilm.

Biofilm forms when mould and bacteria adhere to surfaces in moist environments by excreting a slimy glue-like substance which dust sticks to. The biofilm grows in the cooling coil and releases spores into the air stream. As Biofilm grows it forms a protective shell which traditional cleaners are unable to fully penetrate, making it difficult to remove. Biofilm is also a poor conductor of heat and therefore inhibits the cooling efficiency of the coil. In addition to Biofilm, indoor air quality is also reduced by the circulation of virus and bacteria contaminants brought into the building by people and from the outside air.

How can you improve indoor air quality?
Ultraviolet-C (UVC) light is a powerful tool for arresting the spread of unhealthy contaminants.

UVC inactivates the microbes, bacteria, viruses and mould by altering their DNA, destroying their ability to reproduce.


Source: Steril-Aire

With the correct number of emitters and UVC dose selected according to your cooling coil size and airflow up to 99% of the airborne biological pollutants can be destroyed. UVC will also eliminate the mould that keeps the biofilm attached to the fins of the cooling coil. The dead mould detaches from the metal fins and is washed into the drain pan by the condensate leaving the cooling coils clean.

Benefits of using UVC light sterilisers:

  • Improved energy efficiency. When coils are covered in biofilm the HVAC system needs to work harder, shortening their lifespan and increasing energy costs.  As Air Conditioning typically contributes a significant portion of energy costs there are excellent savings to be made. Some systems claiming payback within 24 months of installation or less.
  • Poor Indoor Air Quality (IAQ) causes 50% of illness in the US according to the Environmental Protection Agency (EPA). With good IAQ decreasing employee absenteeism by 20 – 50%.
  • In food processing plants the use of UVC can enhance food safety through mould, bacteria and virus control extending product shelf life and improving quality and production yields.

If you would like to find out more about installing UVC light sterilisers in your HVAC systems, get in touch with EAS today on 07 834 0505.

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