Apr 23, 2020
In this podcast, Ron Saunders from Fresh-Aire UV comes on and answers questions about UVC. He clears up misconceptions and pulls no punches. Fresh-Aire UV (Triatomic Environmental) used to manufacture and sell ozone solutions, but the business evolved to sell UV and carbon-based IAQ solutions.
UV lights exist on a spectrum of varying wavelengths. Some UV lights at the higher end of the spectrum produce ozone, but UVC light does not. UVC's frequency (~250 nanometers) is outside the range of light that produces ozone (shorter than 185 nanometers).
Like any other IAQ product, UVC lights have advantages and disadvantages. To kill microorganisms, you need a mix of time, intensity, and proximity to the light. Since UVC effectiveness is so multifactorial, studies can be a bit misleading and can make the products look more effective than they really are by letting time and proximity make up for some slack in intensity. Visual light also doesn't necessarily reflect the light's intensity; you must be diligent about replacing them according to manufacturers' specs.
UVC lights can kill all microbes, including viruses like COVID-19. However, light intensity and air velocity are both factors that determine how effectively UVC lights can kill viruses. Viruses don't propagate on coils like mold, though, so you don't have to worry about viral "growth" on coils in the same way you'd deal with fungi or bacteria.
Ron and Bryan also discuss:
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