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 1 of a six-part series.

It’s essential to remember that UV fixtures generally have a maintenance cycle of approximately 9 000 hours.

It’s essential to remember that UV fixtures generally have a maintenance cycle of approximately 9 000 hours.

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.

Breakdown of UV fixture types

“Our portfolio includes a variety of UV units designed for different HVAC applications. While new applications occasionally emerge, our standard units typically handle most common requirements. These units are suitable for different ducting scenarios, whether it’s for coils or cooling systems. It’s essential to remember that UV fixtures generally have a maintenance cycle of approximately 9 000 hours,” says Erasmus.

Cost-benefit analysis

When planning UV installations, a thorough cost-benefit analysis is crucial. This involves summarising all application areas and comparing the costs of different installations. For instance, a large coil area might require numerous fixtures, while supply or return air ducts might only need a couple of units. The goal is to achieve the desired effect at the most cost-effective rate, without incurring excessive maintenance costs.

Accessibility and Safety

Evaluating the accessibility and safety of each installation area is vital. Consider the following:

  • Ease of maintenance: Ensure that UV fixtures are placed in areas that are easy to access and maintain
  • Safety measures: Implement necessary safety measures, such as warning signs and door cut-off switches, especially in confined spaces

Practical applications across various industries

The company’s experience spans over 30 years, covering numerous facilities and industries. Here are some specific applications:

  • Cold rooms: UV and ozone applications are used to maintain hygiene and prolong the freshness of stored fruits
  • Kitchen extraction systems: UV and ozone are employed to manage odors in environments such as fish shops
  • Waste areas: UV and ozone help control odours and create barriers on surfaces
  • Water treatment in hospitals: UV applications are used to manage odours and maintain cleanliness in areas like morgues
  • Data centers: UV fixtures control moisture and mould growth within the ventilation systems
  • Food and beverage industry: UV and ozone are crucial for maintaining hygiene and managing ethylene levels in various food processing environments

Specific industry examples:

  • Cheese and packaged products: Conveyor units with UV applications ensure product safety and hygiene
  • Citrus and apple storage: UV systems have been effectively used for over a decade, preventing mold growth and saving costs
  • Meat processing areas: UV applications ensure sanitary conditions in these sensitive environments
  • Overpopulated areas: Proper ventilation, enhanced by UV fixtures, is crucial in densely populated buildings to ensure air quality.

Continue to part 2…