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KillVir – UV-C Air Disinfection

Equipment for air disinfection by UV-C radiation …

  • immediate elimination of pathogenic microorganisms by passage through the device
  • unrestricted presence of people
  • effective against SARS-CoV-2 and its mutations
  • contaminated air passes close to the UV-C lamps to ensure a high dose of radiation for effective elimination of pathogenic microorganisms
  • powerful fans for efficient room air circulation
  • UV-C tube operating hours counter
  • UV-C tube life 18,000 operating hours
  • dust filter to maintain good efficiency
  • stainless steel design
  • visor for checking UV-C lamps during operation
  • placement under a ceiling,on a wall, or on our stand

Protect your employees, customers, clients and yourself from viruses, bacteria, fungi and other unwanted microorganisms. Offices, meeting rooms, waiting rooms, receptions, workshops, retirement homes, schools, etc.

Description

killvir_uvc_web

Aeroterm “KillVir” is intended for effective disinfection of indoor air where people are or may be present. The device eliminates or inactivates microbes floating in the air in aerosols or on dust particles. The treated air is spirally flowed through a long closed area in which powerful UV-C tubes are placed longitudinally. These tubes do not produce toxic ozone, which can otherwise be generated during the work of UV sources. All internal parts of the device have good reflectivity for UV radiation. All of these factors maximize the radiation density and exposure time, and therefore the dose of UV-C energy that the particles receive in a single pass through the instrument.

Powerful, noise insulated fans transport air along the tubes snd also mix the air in the room. Thus, the disinfecting effect is not limited to the surroundings of the device itself. On the stand, the device can be easily and quickly moved to different areas, where disinfection can be started immediately.

UV-C Radiation

spectrum
The UV spectrum is between 400nm at the visible light (VIS) and 100nm at the X-ray boundary. This invisible radiation is further divided into UV-A (315-400nm), UV-B (280-315nm), UV-C (200-280nm) and UV-V (100-200nm. UV radiation with a wavelength below 280nm can be considered germicidal.The most biologically active wavelengths lie in the UV-C region with the highest value around 265nm.This radiation irreversibly damages the DNA and RNA of cells and prevents them from multiplying.This property is essential for the elimination of microorganisms (viruses, bacteria, fungi) , but it is also potentially dangerous to humans, so when directly disinfecting rooms with UV-C radiation, people must not be in the vicinity of the radiation! The only way how to run UV-C disinfection device in the presence of people is to put a radiation source in a box shield and disinfect the air that actively passes through the equipment.

Germicidal Effects of UV-C Radiation

The resistance of microorganisms to UV-C radiation is the subject of scientific analysis and measurement. From their outputs, it is possible to determine the dose of UV-C energy that the species must receive in order for inactivation. We processed these data for selected types of microorganisms in a table which can be found in the product datasheet below. The energy dose for 90%, 99% or 99.9% inactivation is reported here.

MicroorganismH90 [J/m2]H99 [J/m2]H99,9 [J/m2]
SARS-CoV-218,5-2537-5055,5-75
SARS33-6767-133100-200
Influenza virus3672108
Mycobacterium tuberculosis60120180
Staphylococcus aureus265278
Bacillus anthracis45,290,4135,6
Rotavirus81162243
Corynebacterium diptheriae33,767,3101,1
MicroorganismH90 [J/m2]
SARS-CoV-218,5-25
SARS33-67
Influenza virus36
Mycobacterium tuberculosis60
Staphylococcus aureus26
Bacillus anthracis45,2
Rotavirus81
Corynebacterium diptheriae33,7
MicroorganismH99 [J/m2]
SARS-CoV-237-50
SARS67-133
Influenza virus72
Mycobacterium tuberculosis120
Staphylococcus aureus52
Bacillus anthracis90,4
Rotavirus162
Corynebacterium diptheriae67,3
MicroorganismH99,9 [J/m2]
SARS-CoV-255,5-75
SARS100-200
Influenza virus108
Mycobacterium tuberculosis180
Staphylococcus aureus78
Bacillus anthracis135,6
Rotavirus243
Corynebacterium diptheriae101,1

H represents the dose of UV-C energy required for 90%, 99% and 99.9% inactivation of the microorganism

What Matters

Resistance of Microorganisms

Resistance of microorganisms to the germicidal effects of UV-C radiation as described above. For disinfection efficiency estimation, it is important to know both the dose for inactivation of individual pathogens and the amount of UV-C energy that the device provides per pass. This dose can be found for KillVir instruments in the table of technical parameters below.

Room Type

The type of room (volume, shape and purpose) is also important. The volume is important for selecting the fan power. We follow the principle that the air in the room should be mixed in a maximum of 1-2 hours. Too low fan power also causes imperfect air mixing and only local efficiency of the device. That is why we do not offer such weak fans. It may be better to use several weaker devices in fragmented areas. The device can be hung under the ceiling, mounted on a wall or on a mobile stand on wheels.

Choosing the Right Type

A quick selection of a suitable type of device for a specific room is shown in the diagram below. Parameters determining both the resistance of microorganisms and the type of room are included. Explanations and typical room sizes are below.
killvir_type_selection

RISK:
HIGH RISK: places with a highly probable occurrence of pathogens – medical facilities, surgeries, dental surgeries, laboratories, waiting rooms…
MEDIUM RISK: places with frequent presence of people – canteens, snack areas, meeting rooms, schools, open office…
LOW RISK RATE: places with a low frequency of other people – offices for individuals, apartments…

TYPICAL ROOM SIZES: (with a standard ceiling height of 2.5m)
50m3: 4x5m
100m3: 5x8m
200m3: 8x10m

Technical Parameters
TypeUV-C LampsH [J/m2]Qv [m3/h]Noise [dB(A)]Dimensions [mm]Weight [kg]
HB4754x75W12718751,31561x230x18015
LB4554x55W9117651,31256x230x18012
HB4364x36W7518751,31561x230x18015
LB4304x30W6317651,31256x230x18012
HS4754x75W22410746,71561x230x18015
LS4554x55W1689646,71256x230x18012
HS4364x36W13010746,71561x230x18015
LS4304x30W1159646,71256x230x18012
TypeUV-C LampsH [J/m2]Qv [m3/h]
HB4754x75W127187
LB4554x55W91176
HB4364x36W75187
LB4304x30W63176
HS4754x75W224107
LS4554x55W16896
HS4364x36W130107
LS4304x30W11596
TypeNoise [dB (A)]Dimensions [mm]Weight [kg]
HB47551,31561x230x18015
LB45551,31256x230x18012
HB43651,31561x230x18015
LB43051,31256x230x18012
HS47546,71561x230x18015
LS45546,71256x230x18012
HS43646,71561x230x18015
LS43046,71256x230x18012
TypeUV-C Lamps
HB4754x75W
LB4554x55W
HB4364x36W
LB4304x30W
HS4754x75W
LS4554x55W
HS4364x36W
LS4304x30W
TypeH [J/m2]
HB475127
LB45591
HB43675
LB43063
HS475224
LS455168
HS436130
LS430115
TypeQv [m3/h]
HB475187
LB455176
HB436187
LB430176
HS475107
LS45596
HS436107
LS43096
TypeNoise [dB (A)]
HB47551,3
LB45551,3
HB43651,3
LB43051,3
HS47546,7
LS45546,7
HS43646,7
LS43046,7
TypeDimensions [mm]
HB4751561x230x180
LB4551256x230x180
HB4361561x230x180
LB4301256x230x180
HS4751561x230x180
LS4551256x230x180
HS4361561x230x180
LS4301256x230x180
TypeWeight [kg]
HB47515
LB45512
HB43615
LB43012
HS47515
LS45512
HS43615
LS43012

H represents the dose of UV-C energy provided in one pass through the device

Qv represents the real air flow through the device in 1 hour – it is recommended that the device changes the air in the room in a maximum of 1-2 hours

FAQ

What is ultraviolet germicidal radiation?

This is a disinfection method that uses ultraviolet (UV) radiation with a short wavelength of 200 – 280nm (this area is referred to as UV-C) to inactivate or kill pathogenic microorganisms. It can be used to disinfect surfaces, air and water.

What dose of UV-C energy is required to kill or inactivate the SARS-CoV-2 virus causing COVID-19?

This virus is so new that more of this data has not yet been published. However, we found the first results of work in this field from Italy, the USA and the Netherlands. A summary of their results is given in a clear table. Values for influenza virus and tuberculosis bacteria are given for comparison:

PathogenH90 [J/m2]H99 [J/m2]
SARS-CoV-218,5-2537-50
influenza virus3672
TBC60120

H90 (H99) – the dose of UV-C energy required for 90% (99%) inactivation of the
pathogen

However, some well-known similar viruses from the SARS family need values up to 2.6 times higher than the SARS-CoV-2 virus. More detailed tables for other pathogenic microorganisms can be found in the Aeroterm KillVir Datasheet or web page.

What parameters should the disinfection device have and how to choose it?

First of all, it is necessary to determine which microorganisms we want to eliminate and with what percentage of efficiency (for table data, see eg the Aeroterm KillVir Datasheet or web page). It is necessary to take into account the nature of the room (office, waiting room, dental office…). Microbiological pollution is brought by people and animals – it is therefore necessary to consider their number, density, number of arrivals. Accordingly, determine by which reserve to increase the selected required dose of UV-C energy. Indeed, the minimum reserve should be 20% to reduce the efficiency by dusting UV emitters and 10% to reduce the efficiency of UV-C emitters at the end of their service life. The device is then selected according to the minimum amount of UV-C energy thus determined and increased. The disinfection device must provide this necessary increased amount of UV-C energy, – ie. a dose equal to or greater than the indicated dose for the pathogen per pass of air through the device. Every manufacturer or retailer must state these essential parameters. Of course, there are also a number of products on the market whose effect is undefined, and this absence is being replaced by massive advertising and strong expression.

Example:

We decided to eliminate not only the SARS-CoV-2 virus, but also, with 99% efficiency, the influenza virus, which will attack us in various mutations even after the pandemic subsides. Influenza viruses are more resistant than SARS-CoV-2 and a dose of UV-C energy H99 = 72J/m2 is required for their 99% elimination. If we consider a reserve of 50% (30%), we will require the disinfection device to provide a dose of UV-C energy E = 72×1.5 = 108J/m2 (94J/m2). This corresponds to the Aeroterm KillVir HB475 device with a dose of H = 127J/m2 (suitable for large rooms) or the Aeroterm KillVir LS430 type, which provides a UV-C energy dose of H = 115J/m2 (suitable for smaller rooms).

How to choose a device for a given room size?

A very important function of the disinfection device is to be able to move the air in the room so that the desired air circulation occurs throughout the room and not only in the immediate vicinity of the device.

For example, the air in a smaller room 6x4x2.6m, whose volume is 62.4m3, weighs about 75kg. These facts require that the device be equipped with a powerful fan unit. The optimal condition is that the volume of the room is pumped by the device within 1 hour, the worst within 2 hours. The sooner, the faster the disinfection effect starts. This corresponds to the fact that for a given device, the optimal room size is up to the value of the stated actual air flow through the device (some manufacturers state the nominal fan flow, but the actual flow is significantly lower). However, it must always be the case that the device must emit a sufficient dose of UV-C energy to inactivate the pathogen. For larger rooms and complicated rooms, more devices can be purchased. For rooms with high risk and frequent door opening frequency, it is necessary to choose a device with the highest possible air flow.

Example:

Aeroterm KillVir LS475 device with UV-C energy dose H = 127J/m2 and air flow through the device Qv = 187m3/h or eg Aeroterm KillVir LS430, with UV-C energy dose H = 115J / m2 and flow Qv = 96m3/h can be used for 99% elimination of influenza virus. These devices provide a similar dose of UV-C energy, but differ in the value of the air flow through the device. Type HB475 is therefore optimal to use in rooms up to 187m3 (11x6x3m), type LS430 in rooms up to 96m3 (7x5x2.7m).

How should I use the KillVir disinfection device? Is a shorter time enough or should it be switched on all the time?

The KillVir UV-C disinfection device has the unique advantage that it can work even in the presence of people and thus continuously reduce the amount of pathogens in the room. The device can be operated continuously, 24 hours a day for 18,000 operating hours (approx. 2 years). Then the UV-C tubes need to be replaced. If you need to move to different rooms and try to keep it in the room in the shortest possible time, it is necessary to remember that the air in the room has to be put in motion and circulate for a while. We recommend a minimum of 2 hours for a room that has a volume less than or equal to the flow rate of the particular model. In larger rooms, up to twice that time. In general, however, it is best to have the disinfection device switched on while people are in the room and ideally for at least an hour afterwards in order to continuously disinfect the air. Otherwise, the microbiological load would continue to increase. This should be supplemented by disinfecting the surfaces (by wiping the surfaces with a disinfectant solution, etc.).

What is the main advantage of this method of disinfection? What makes this method other than disinfecting with ozone or spraying disinfectant solutions?

KillVir UV-C air disinfection is unique in that it works in the presence of people and continuously spraying disinfectant solutions must not be used in the presence of persons (there is a risk of reduces the microbiological load in the room. Conversely, disinfection with ozone or by poisoning and other health risks) and must therefore be applied only after all-day operation. During operation, however, there is a continuous increase in the microbiological load in the room to which people are exposed inside. Chemicals or ozone also act on surfaces, but they can also have degrading effects. In terms of different effects and application time, these methods can effectively complement each other.

What are the competitive advantages of Aeroterm KillVir devices?
  • highest UV-C performance, efficiency and durability
  • the values ​​of the UV-C energy doses provided by the individual types of the device and the doses needed to inactivate the individual pathogens are given, so the appropriate type can be chosen exactly
  • immediate elimination of pathogenic microorganisms as they pass through the device
  • unrestricted presence of persons
  • absence of contaminated waste
  • tight passage of contaminated air around UV-C lamps ensures a high dose
    irradiation for the effective elimination of pathogenic microorganisms
  • powerful fans for efficient room air circulation
  • made from premium Philips components, UV-C tube life 18,000 operating hours (approx. 2 years of continuous operation)
  • the dust filter prevents contamination of the internal reflecting surfaces of the device and thus of sagging
    effectiveness
  • all-stainless steel design – representative appearance and easy cleaning
In which units are the parameters of the disinfection devices given? How are watts and joules related?

Watt is a unit of power, ie the amount of energy delivered per unit of time. The joule is a unit of the amount of energy. For disinfection purposes, their density is decisive, so it is necessary to apply them to an area of 1 m2. The radiation power incident per 1 m2 is called the radiation density E and its unit is W / m2. The energy of radiation that fell during the exposure time t per 1m2 is called the dose H. It is the product of the radiation density E and the exposure time t, ie:

H = E x t,

The dose has the unit Ws/m2 = J/m2.

When disinfecting with UV-C radiation, it should of course be the energy radiated in the UV-C region. Conventional UV-C emitters in this area emit approximately 1/3 of their total power!

What about ozone formation during the operation of UV emitters and what about ozone at all, because it is also used for disinfection?

Ozone is a highly reactive gas (a strong oxidant). It is naturally found in the high layers of the atmosphere, where it protects us from the penetration of UV-C radiation from the sun. In the ground layers of the atmosphere, it is created when the sun’s rays shine into the air air polluted by human activity. However, its stability is low, its lifespan is in units of seconds and it decomposes into normal oxygen. However, new ozone molecules are still being formed under suitable conditions. In the indoors conditions, this is an undesirable immission because it is harmful to human health.

With sufficient concentration, it kills all microorganisms, so it is also used for disinfection. During this disinfection, the presence of people is excluded and the room must then be thoroughly ventilated. The corrosive effects of ozone must also be taken into account.

Ozone is generally produced when UV emitters work. It causes UV radiation with wavelengths below 240 nm. The extent to which these wavelengths can be filtered out (special types of glass, filters…), the extent to which the formation of ozone by UV sources is suppressed. For UV-C tubes used in AEROTERM’s KillVir, the ozone concentration is below the limit of quantification.

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