Coronavirus (COVID-19)

Ultra-violet (UV) light provides high-energy germicidal solutions against mold, bacteria, viruses and other microbial growth. The use of UV light as a germicidal application within a building’s HVAC system has been an accepted solution and growing in popularity over the past couple decades. The same technology can be used to disinfect hospital/patient rooms and personal protective equipment, however there are many unknown factors centered around COVID-19 and that leaves many people uncertain about the effectiveness of UV light as a disinfectant. In today’s post we’re going to share the science behind this technology.

What is Ultra-violet?

Ultra-violet light is one form of electromagnetic energy produced naturally by the sun. UV is a spectrum of light just below the visible light and it is split into four distinct spectral areas – Vacuum UV or UVV (100 to 200 nm), UVC (200 to 280 nm), UVB (280 to 315 nm) and UVA (315 to 400 nm).

Image provided by Steril-Aire.

The entire UV spectrum can kill or inactivate many microorganism species, preventing them from replicating. UVC energy at 253.7 nanometers provides the most germicidal effect. The application of UVC energy to inactivate microorganisms is also known as Germicidal Irradiation or UVGI.

UV-C exposure inactivates microbial organisms such as bacteria and viruses by altering the structure and the molecular bonds of their DNA (Deoxyribonucleic acid). DNA is a blue print” these organisms use to develop, function and reproduce. By destroying the organism’s ability to reproduce, it becomes harmless since it cannot colonize. After UV-C exposure, the organism dies off leaving no offspring, and the population of the microorganism diminishes rapidly.

Image provided by Steril-Aire.

Ultra-violet germicidal lamps provide a much more powerful and concentrated effect of ultraviolet energy than can be found naturally. Germicidal UV provides a highly effective method of destroying microorganisms.

UVGI COVID-19 Disinfection Applications

A variety of UVGI applications are available on the market. Many UV-C solution providers are willing to customize solutions based on your needs. Combat COVID-19 from all directions with any of the following applications.

Air-handler Disinfection Steril-Aire emitters inside an AHU at Amity High School
AHU/RTU & Airstream Disinfection
Image provided by Fresh-Aire.
Make-up Air & Exhaust Disinfection
Image provided by Fresh-Aire
Room/Surface Disinfection (unoccupied)
Image provided by Fresh-Aire.
Face Mask Disinfection
Schematic from ResearchGate article linked below.

Additional Resources

Below are links to provide you additional information related to using UV-C to combat COVID-19. Don’t take our word for it – take the science behind it!


UV Disinfection of N95 Filtering Facepiece Respirators


UV Light Assists in Efforts to Contain COVID-19



Flow Tech is proud to represent two UVGI manufacturers, Steril-Aire and Fresh-Aire UV. We are happy to work with you on a COVID-19 specific project or anything in the future. For more information contact Tom Proietti, call us at 860.291.886 or visit our website. You can always stay up-to-date on our latest news by following us on social media: Facebook, LinkedIn, Twitter and YouTube.

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