Frequently Asked Questions (FAQs) For Mobile UV System (MUVS)
What is Germicidal UV (GUV) and UVGI?
Germicidal UV (GUV) is the use of a specific spectrum of ultraviolet light to inactivate viruses, bacteria, mold spores, fungi and other organic organisms. When deployed in a specific location, this is typically referred to as ultraviolet germicidal irradiation (UVGI).
Is all ultraviolet considered Germicidal UV?
Only UV-C, which is specifically in the spectral band or wavelength range from 200-280nm is considered GUV and effective for disinfection applications. The Mobile UV System outputs UV-C at 254nm.
How useful is UV-C for disinfecting air and surfaces?
UV-C light has been used extensively for more than 40 years for disinfecting air and surfaces against a wide variety of human pathogens (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 variations of coronaviruses) respond favorably to UV disinfection.
How long would it take to treat a 20ft x 15ft room?
The MUVS is most effective when used in combination with standard cleaning protocols. After standard cleaning of the room has taken place, the MUVS can be placed in the room in a location that maximizes the area within the room that will be reached by the light. Most users stack the MUVS to allow the light to be higher and therefore be exposed to the surfaces of tables and desks. As the technology depends on light, it cannot see around corners and is not effective in shaded areas.
In a 20ft x 15ft room where the MUVS can be within 10ft from all surfaces, approximately ten (10) minutes is all that is needed to deliver an effective dose of UV-C to the air and surfaces within the room. In larger rooms, we recommend that the MUVS is repositioned after each treatment to deliver multiple doses that allow all surfaces to be within 10 feet of the MUVS. If repositioning is not possible, a longer dose time may be effective depending on the layout and size of the room.
Is UV-C dangerous for humans?
The Mobile UV System can be confidently and safely operated when following appropriate operating instructions and precautions. A great deal is known about the human exposure limits of 254nm UV (UV-C). Compared to the UV-A and UV-B in sunlight, UV-C is almost entirely absorbed by the outer dead layer (stratum corneum) and outer skin (outer epidermis), with very limited penetration to the deeper cellular layers of skin where new cells are constantly created. For comparison, the current daily safety limit of 254nm UV-C is 8 hours at 6.0 mJ/cm2, which is less than ten minutes of summer sun exposure at a UV Index of 10! This is because normal sunlight includes much more-penetrating UV-A and UV-B.
The human eye is most susceptible to sunlight and GUV exposure. 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 can be painful but is temporary, with corneal shedding and replacement in a day or two.
There are no known long-term consequences from an accidental UV-C overexposure. Most accidental eye injuries result from workers working in the room without first turning off the MUVS.
What happens if a UV-C bulb breaks?
The Mobile UV System has a cover that should be installed while storing and transporting the device to prevent the accidental breakage of the glass UV-C bulbs. During normal operation, no one should be near the device so the chance of accidental breakage is very low.
The UV-C bulbs used in the Mobile UV System contain a small amount of mercury (<0.1% amalgamated with other metals) in a glass bulb. Care should be taken when cleaning up the glass, and vacuums should be avoided to minimize the spread of the small amount of mercury in the air. Detailed instructions for cleanup can be found in our Safety Guide.
Shatterproof bulbs are available for the Mobile UV System. Please speak with our Product Specialists for details. The shatterproof bulbs are encased in plastic to contain the glass and other materials in the event of breakage. The tradeoff is approximately a 5% reduction in UV-C efficacy due to the plastic coating.
Call one of our experienced Product Specialists for answers or send us an email at Sales@AVTECH.com
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