Page 1 R-Zero Systems, Inc. | Frequently Asked Questions about UV-C Disinfection for Healthcare Settings
Frequently Asked Questions about UV-C
Disinfection for Healthcare Settings
The Basics of UV-C Disinfection
How does UV-C disinfection work?
UV-C is invisible light with a wavelength between 200nm and 280nm. UV-C damages the DNA and RNA of
microorganisms and disrupts vital cellular functions, preventing these microorganisms from replicating or spreading.
The germicidal properties of UV-C have been studied and proven for over 100 years, and researchers have published
thousands of peer-reviewed studies proving UV-C's germicidal efficacy.
What is the difference between UVGI and Far-UVC?
Within the spectrum of UV-C light, there are different wavelengths of light whose use cases vary. Upper room
ultraviolet germicidal irradiation (UVGI) or upper room germicidal UV is one application that may use 254nm or 265nm
UV-C light to disinfect the air in the upper portion of an occupied space. As air naturally rises, the air passes through
an ultraviolet irradiance zone and is disinfected. UV-C towers for unoccupied spaces may also use GUV or UVGI at
254nm or 265nm. Far-UVC applications most commonly use 222nm UV-C light to disinfect the air and surfaces in an
occupied space. Unlike other wavelengths of UV-C light, Far-UVC cannot penetrate the outer layers of human skin and
eyes and is consequently safe for human exposure – hence its use in occupied spaces.
What regulatory bodies govern the use of UV-C disinfection? Is the CDC
affirming UV-C's effectiveness?
UV-C devices are regulated by the FDA and the EPA. In addition, the CDC, ASHRAE, and WHO have all acknowledged
UV-C as a valid disinfection method. Within the UV-C industry, the International Ultraviolet Association (IUVA) also
functions as a thought leader and provider of education and resources on UV applications.
X-RAYS
VACUUM-UV
100
Wavelength (nm)
200 280 315 400 780
UV-C UV-B UV-A THE ELECTROMAGNETIC SPECTRUM
ULTRAVIOLET VISIBLE LIGHT INFRARED
