Compiled by Eamonn Ryan from the 3rd SAIRAC Johannesburg Tech Talk online presentation by Edward Erasmus on the topic ‘Guided Approach to Applying UV-C to Mechanical Ventilation Systems’. This is an extension of the summary published in RACA August, and is Part 6 of a six-part series, and this part is a summary.
Installing UV units in these environments is a proactive measure to prevent such health issues. Image by freepik
Edward Erasmus, represents Sani UV-C, a company that specialises in UV-C application used across various applications including cold rooms, vehicle transportation, HVAC systems, and water systems.
In summary, understanding the specifics of each building and its HVAC system is crucial for effective UV installation. Our approach ensures comprehensive pathogen control, enhancing indoor air quality and addressing issues related to Sick Building Syndrome.
The role of UV lights in ducting maintenance
Maintaining clean air ducts is crucial for ensuring the health and safety of building occupants. Over time, ducting can accumulate moisture and develop biological growth, leading to costly maintenance and potential health risks. Integrating UV lights within the HVAC ducting system offers a preventative solution.
Cost efficiency and health benefits
A typical supply air duct, measuring 1 meter by 500 mm, can be maintained with a 100-watt UV light. Running this light continuously throughout the year would cost approximately 800 Rand. This investment is minimal compared to the costs associated with cleaning contaminated ducts or addressing health issues caused by poor air quality. The presence of UV lights in the ducts ensures:
- Clean ducting: Prevents biofilm and mold growth, maintaining a hygienic air supply.
- Health safety: Reduces the risk of airborne diseases, ensuring the building does not contribute to employee or customer illness.
Addressing health concerns
Building-related illnesses, such as tuberculosis or Legionnaires’ disease, are significant concerns, particularly in older buildings with outdated ventilation systems. Installing UV units in these environments is a proactive measure to prevent such health issues. UV lights are especially useful in areas where access to coil surfaces is limited but duct access is feasible.
Assessing and comparing costs
When planning UV installations, it’s essential to compare costs and benefits across different parts of the HVAC system:
- Coil areas vs duct units: While coil areas may require fewer units, duct systems might need multiple installations. Analysing the total cost, including the number of units and the ongoing maintenance expenses, is vital for making an informed decision.
Conclusion and final thoughts
Integrating UV technology into HVAC systems is a cost-effective and health-conscious strategy. It ensures cleaner air ducts, reduces maintenance costs, and safeguards the health of building occupants. By understanding and implementing UV solutions effectively, facilities can maintain high indoor air quality standards and prolong the lifespan of their HVAC systems.
