How it works
After your usual deep clean happens, the Portable UV-C Room Sterilizer is brought into the room/area to be
sterilized, the timer is set according to the size of the room and plugged into a standard socket. The person
operating the unit leaves the room which remains empty during the period of use and the unit automatically
switches on 2 mins later.
No special training is required, and units can be stacked to save time and ensure more areas are covered by
the Ultraviolet light (UV-C).
What is germicidal UV, and what is UVGI?
Is all ultraviolet considered germicidal ultraviolet (GUV)?
Can UV-C kill viruses as well as bacteria?
Can UV-C effectively inactivate the SARS-CoV-2 virus, responsible for COVID-19?
Can near-ultraviolet (UV-A) lamps, such as UV insect traps, be used for GUV?
Light-emitting diodes (LEDs) have been available for some time in the UV-A region. The advantage of UV-A or visible-light LEDs would be that they can easily be incorporated into LED-based luminaires, and there might be no need for protective gear. However, the efficacy of violet or UV-A energy that is not harmful to the skin or eyes is minimal.
Does the ultraviolet in sunlight have a GUV effect?
Medical & Healthcare
How long do virus particles and bacteria remain airborne
How can airborne spread viruses be reduced?
How does GUV work to disinfect air?
Has GUV been useful in medical treatment facilities?
Medical treatment facilities are using GUV in three primary ways: 1) upper-room GUV fixtures with air mixing, for controlling airborne pathogens in an occupied space; 2) mobile GUV units, to disinfect high-touch surfaces; and 3) GUV in HVAC air handling units, to treat recirculated air and to reduce mould growth on cooling coils. Mobile GUV units were used in the People’s Republic of China in response to COVID-19.
How do research scientists determine efficacy for killing or deactivation of different microorganisms and viruses?
The most fundamental concept in photobiology is the action spectrum (or relative response) for a given effect. This action spectrum extends from 235 nm to 313 nm and peaks at approximately 265 nm. A wavelength of 254 nm has a relative efficacy of 0.85; by contrast, 313 nm in the UV-B has a relative efficacy of only 0.01.
How useful are UV-C rays in disinfecting surfaces? PPE? Are UV-C Wands effective?
UV-C light has been used extensively for more than 40 years in disinfecting surfaces against a whole suite of human pathogens (Fluence UV Dose Required review IUVA: https://www.iuvanews.com/stories/pdf/archives/180301_UVSensitivityReview_full.pdf ). All bacteria and viruses tested to date (many hundreds over the years, including other coronaviruses) respond to UV disinfection. Some organisms are more susceptible to UV-C disinfection than others, but all tested so far do respond at the appropriate doses.
COVID-19 infections can be caused by contact with contaminated surfaces and then touching facial areas (less common than person-to-person, but still an issue). Minimizing this risk is key because COVID-19 virus can live on plastic and steel surfaces for many hours. Normal cleaning and disinfection may leave behind some residual contamination, which UVC can treat suggesting that a multiple disinfectant approach is prudent. Accepting that where the UV-C light cannot reach a particular pathogen, that pathogen will not be disinfected. However in general, reducing the total number of pathogens reduces the risk of transmission. The total pathogenic load can be reduced substantially by applying UV to the many surfaces that are readily exposed, as a secondary barrier to cleaning. Many published studies conclude that UVGI lamps is effective on the spread of infectious respiratory diseases e.g. https://www.ajicjournal.org/article/S0196-6553(15)00757-9/fulltext .
Can GUV be used to disinfect surgical masks and the N95 respirator mask?
Are GUV wands effective for disinfecting surfaces?
As it has no outer dead protective layer, the human eye is the organ most susceptible to sunlight and GUV. Exceeding the threshold level value (TLV) will result in painful irritation of the cornea similar to over-exposure on a sunny day, especially from sun reflected from water or snow. The damage is painful but transitory, with corneal shedding and replacement in a day or two.
There are no known long-term consequences from an accidental UV-C overexposure. Most eye injuries result from workers cleaning fixtures or working in the room without first turning off the fixtures.
Are there safety rules for GUV surface-disinfection lamps?
• Cleaning staff should place temporary warning signs at access points to the area being disinfected. They should either vacate the area during disinfection or place opaque barriers between the UVGI lamp and room occupants. If these areas are required to be occupied during disinfection and exposures cannot be avoided then personal protective equipment (PPE) should be used.
• Low- and medium-pressure mercury lamps, UVGI LEDs, and far UV-C lamps. Workers should wear plastic or glass face shields to protect the eyes and face, nitrile gloves or work gloves to protect the hands, and full-coverage clothing with tightly woven fabrics to protect all other exposed skin.
• Pulsed xenon arc lamps. Workers should wear welding or cutting goggles to protect the eyes, nitrile gloves or work gloves to protect the hands, and full-coverage clothing with tightly woven fabrics to protect all other exposed skin.
Do eye or skin hazards differ depending upon the lamp type used?
Low- and medium-pressure mercury UVGI lamps emit UV energy that poses a hazard to the cornea and skin. Some UVGI LED devices emit near 270 nm, which poses a hazard to the cornea and skin. “Far UV-C” lamps that emit around 222 nm can pose a hazard to the cornea, and recent studies have been inconsistent regarding whether far UV-C lamps pose a significant skin hazard. Differences may be the result of different glass envelopes allowing some longer-wavelength radiant-energy transmission.
Pulsed xenon arc UVGI lamps emit UV and visible radiant energy that poses a hazard to the retina,cornea, and skin. Some pulsed xenon arc lamps are filtered so that only the UV energy for disinfection is emitted. Xenon arc lamps can also pose additional safety hazards if they are not maintained properly.
These GUV lamps are generally used only in industry, to sterilize food and pharmaceutical containers, for example, but also have been used in GUV devices for hospital room disinfection. Maintenance and service should only be performed by authorized persons.
Will GUV increase my lifetime risk for skin cancer?
If the room has glass that permits vision into the room and a view of the UV fixtures, does that glass need to be shuttered or covered?
What types of lamp sources are used for GUV?
What is currently the most widely used lamp source of UV-C for GUV?
Approximately 45% of the input power from such a device is emitted at a mercury-discharge wavelength of 253.7 nm, in the middle of the UV-C band. The second major emission line is at 184.9 nm, but this emission is normally absorbed by the glass, since—if emitted through the glass, as it is with pure quartz—it would create ozone at levels far above the safety limit.
Are there higher-output UV-C lamps?
Other sources, such as rare gas-halogen (e.g., krypton-chlorine, Kr-Cl) discharge, have been shown to produce significant emission in the far UV-C region (205 to 230 nm). The advantage of sources such as those emitting 207 nm or 222 nm, is that the deactivation rate of some bacteria and viruses appears to be relatively high, and the effect of the emission on human skin and eyes is much reduced compared to the 253.7-nm mercury emission. However, depending on the glass envelope, small but significant levels of longer wavelengths may be of concern. At this time, such sources have been developed in the research laboratory, but their presence in the marketplace is still very limited in comparison to that of mercury lamps, and there is little experience yet with any widespread use.
Are there UV-C emitting LEDs available?
How much UV “light” is required, and how long does the process take, to disinfect a volume of air or a surface?
Although this sounds too simplistic to be true, since air in any room is always moving and mixing, one can correctly assume that all air will be treated—the better the air mixing, the sooner this will happen. Studies at the Harvard School of Public Health and elsewhere show log units of reduction equivalent to 24 ACH to achieve 80% reduction of transmission. Of course, 100% reduction is not possible, because of the multiple modes of transmission. To disinfect surfaces, this depends on the type of surface and its cleanliness; recommended exposures vary from 20 to 100 mJ/cm2
How can I measure the light to make sure I’m getting the appropriate amount to get effective disinfection?
Safety readings require the lower range, and efficacy requires a range up to at least 10 mW·cm-2. A common practice is to have two calibrated meters: one in reserve and for reference. The two instruments should be periodically compared. The user should retain the manufacturer’s instructions, including a description of the meter, its safe use, and maintenance and calibration of it. Some healthcare facilities contract with a full, outside maintenance contractor that uses calibrated meters and correctly and safely replaces burned-out lamps. Some users retain a simple, less precise meter for staff to use, but the installer uses a professional meter.
How would it work in the case of a standard room ...How long to treat a 20 x 13ft room 6m x 4m with chairs, coffee tables and magazines? Time to treat?
This technology cannot see around corners or into shaded areas. It will not disinfect the inner pages of magazines which are not exposed. Depending on room layout, it may need to be moved/ repositioned a number of times to get the best possible result. Stacking units can help increase coverage. Having said that, the approx. time for the size of room you mention with furniture, magazines etc using one unit is approx. 10 minutes.
How specifically does it address COVID-19 contamination, and protect workers and users of medical facilities from infections?
UV-C light has been used extensively for more than 40 years in disinfecting drinking water, waste water, air, pharmaceutical products, and surfaces against a whole suite of human pathogens (Fluence UV Dose Required review IUVA: https://www.iuvanews.com/stories/pdf/archives/180301_UVSensitivityReview_full.pdf ). All bacteria and viruses tested to date (many hundreds over the years, including other coronaviruses) respond to UV disinfection. Some organisms are more susceptible to UV-C disinfection than others, but all tested so far do respond at the appropriate doses.
COVID-19 infections can be caused by contact with contaminated surfaces and then touching facial areas (less common than person-to-person, but still an issue). Minimizing this risk is key because COVID-19 virus can live on plastic and steel surfaces for many hours. Normal cleaning and disinfection may leave behind some residual contamination, which UVC can treat suggesting that a multiple disinfectant approach is prudent. Accepting as mentioned above that where the UV-C light cannot reach a particular pathogen, that pathogen will not be disinfected. However in general, reducing the total number of pathogens reduces the risk of transmission. The total pathogenic load can be reduced substantially by applying UV to the many surfaces that are readily exposed, as a secondary barrier to cleaning.
Can GUV be used in the home?
Does UV degrade paints and other wall materials, or hurt plants?
Furthermore, shorter-wavelength UV photons have higher energy potential than longer-wavelength UV photons, and may have an accelerated aging effect on materials and paints. UV-C may damage plants; therefore, hanging plants should not be placed in the disinfection zone in upper-room applications or in whole-room UV-C applications.
How effective are UV robots for surface disinfection?
What role has it in the equine sector?
- Inactivates virus' and kills bacteria both in the air and left behind on surfaces after a clean and
- Provides reassurance to both employees and clients that a business (be that a Hairdressers, a Physio, a General Practitioner, a Dentist, a Solicitor, a GYM operator, Changing Rooms etc etc) is taking every step to protect their health while on the premises.
UV-C is a proven solution for killing virus and bacteria remaining on surfaces after a deep clean and is an additional line of both attack and defence on top of a regular deep clean. We have tried to factor into our brainstorming a vision of what the ‘new normal’ will be and how we live with that. This is a product that once in the ‘arsenal’ of your office cleaning is a tool you can use as and when you wish, is very simple to use and gives the user a heightened sense of confidence in the deep clean that has taken place.
If you are interested in becoming a distributor or partner, we offer an affiliate program which is open to interested parties, worldwide.
We’re delighted that our portable UV-C Sterliser (MUV-X) has been featured in a number of publications. We invite you to read what people have to say about our product.
Garage Door Systems
“Additional protection & reassurance for our team & customers to help sterilise our business premises ongoing. This should be of interest to many other businesses & could also help get you up and running more safely and provide additional reassurance for your teams & customers. Many thanks to John O’Connell from CW Applied Technology for supplying Garage Door Systems with 3 of these Room UV Sterilizers.As well as implementing our enhanced internal hygiene & social distancing procedures these Room UV units will provide an added layer of protection and reassurance at Garage Door Systems to regularly sterilise high traffic & all communal areas.Portable to manoeuvre and very effective in the sterilisation of virus & bacteria during these times. Thanks John & all at CW Applied Technology for this innovative bit of technology.If you would like to find out more on how these units work and might help benefit your business get up and running safely again please visit their website below and speak with John.Garage Door Systems are not connected to CW Applied Technology in any way just sharing our experience and trying to help get our business communities up and running safely as we learn.”
Professor Karen Redmond MB BCh BAO MD FRCS CTh Consultant Thoracic & Transplant Surgeon
“We will be using a Mobile UV-C Room Sterilisation unit @vaughanlodge
manufactured by an Irish and Shannon Firm @CWAppliedtech providing a chemical free solution to safe hotel spaces”