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UV Light and Air Disinfection

UV Light and Air Disinfection

During the pandemic, disinfection for not only surfaces, but also air has become paramount to fostering occupant health, safety, and confidence in many facilities. Discover the role that UV light technology plays in creating higher indoor air quality (IAQ).

September 23, 2020
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Ultraviolet Technologies for Air and Surface Disinfection

Background

Ultraviolet (UV) light technologies have been recognized for their potential to reduce environmental pathogens and protect against contaminated air, surfaces, and water. This white paper aims to provide a comprehensive understanding of the science, safety, and potential best solutions involving UV technologies for facilities.

UV Disinfection Technologies

There are four primary categories of UV disinfection solutions:
1. Installed Lighting
2. HVAC Systems
3. Upper Room Systems
4. Mobile Systems

These technologies augment standard cleaning and disinfection practices. However, UV technology has limitations and requires proper cleaning to effectively reduce pathogen spread.

How Does UV-C Work as a Germicide?

The germicidal effectiveness of UV-C light depends on:
- Wavelength: UV-C radiation between 200-280 nm disrupts the DNA of pathogens, preventing reproduction and causing cell death.
- Contact Time: The duration of exposure or dose is crucial for effective disinfection.
- Intensity: The strength of the light reaching the surface impacts its germicidal effectiveness.

Is UV Safe for Humans?

Most UV wavelengths can damage human tissue. UV-C must be used with safety controls to shield humans from exposure. Far-UV (200-222 nm) has shown potential for safe human exposure, but precautions are still necessary.

Use Cases for UV-C and Alternatives:

- Installed UV Lighting: Requires safety measures such as motion sensors or physical barriers to prevent exposure to humans.
- HVAC UV-C Systems: Common in air ducts to improve air quality by targeting airborne pathogens.
- Upper Room UV-C Systems: Used in settings like hospitals to treat air in upper parts of rooms, out of direct human contact.
- Mobile UV-C Systems: Portable units that require careful handling to avoid direct human exposure during operation.

Safety and Efficiency

While UV technology offers effective disinfection, its use must be carefully managed to ensure both efficacy and safety. Proper installation, use, and maintenance of UV systems are crucial.

Conclusion

UV technologies can significantly enhance environmental disinfection efforts but must be implemented with an understanding of their limitations and safety requirements. As research evolves, the applications and safety measures of UV technology will continue to improve, offering better solutions for maintaining clean and safe environments.

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