Guide: UVC disinfection for the air - how it works, advantages and systems

Why is air disinfection important?

Indoors, there are numerous pathogens such as bacteria, viruses and mold spores that spread via droplet infection or aerosols. The risk of infection increases particularly in enclosed spaces with large numbers of people, such as offices, schools or public facilities. UVC disinfection is an effective method of reducing germs, as it does not require chemicals and acts directly against the pathogens.

How does UVC disinfection of the air work?

UVC technology uses ultraviolet light with a wavelength of around 254 nm. This radiation destroys the DNA and RNA of microorganisms so that they can no longer multiply. Disinfection takes place in special UVC disinfection systems that guarantee safe and effective germ reduction.

Why is UVC disinfection the best choice?

• Effective germ reductionCaptures even resistant pathogens and inactivates them safely.
• Chemical-free disinfection: Leaves no residues or harmful by-products.
• Immediate effectNeutralizes microorganisms within a few seconds of contact.
• Lasting solutionLow energy consumption and no running costs for consumables.

Variants of UVC air disinfection

1. passive system with open emitter

These systems rely on open UVC lamps that emit directly into the room air.

• AdvantagesHigh efficiency as the room air is irradiated directly, low-maintenance operation as there are no moving parts.
• DisadvantagesDirect UVC radiation damages skin and eyes, use only in the absence of people or in shielded areas.

Typical applications: Disinfection of unused rooms (e.g. at night in hospitals, laboratories, production areas), high-risk areas with a high germ load.

2. active system with fan

Here, a closed UVC disinfection unit guides the room air past the UVC lamp with the aid of a fan and emits the cleaned air again.

• AdvantagesSafe operation while people are present, uniform air circulation and continuous disinfection, no ozone formation or chemical residues.
• DisadvantagesLower efficiency per unit of time than open radiators, as the air must actively flow through the device, regular maintenance of the fan required.

Typical applications: Schools, offices, waiting rooms, restaurants, gyms, areas with continuous movement of people.

Conclusion

UVC disinfection is a sustainable, chemical-free and effective method of air purification. Passive systems with open emitters enable direct, rapid germ reduction, but can only be used under certain safety precautions. Active systems with fans, on the other hand, allow continuous air disinfection during operation and thus ensure clean room air. Depending on the location and requirements, the right UVC solution can be selected to effectively reduce the risk of infection.