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Blue.care+ against indirect infection

Make short work of Covid-19!

Whether in the classroom, office, medical facilities, seminar room or restaurant – the Blue.care+ antiviral air purifier creates clean air and reduces the risk of indirect infection from corona viruses.

After only 10 minutes, the virus load of the room air decreases by 50 %, after only 30 minutes even by 90 % (room size 80 m²) at an air exchange rate of 6 times per hour.

The HEPA class H14 combination filter achieves a filter efficiency of ≥ 99.995 %. Fine dust, allergens, bacteria and the smallest viral contaminated aerosol particles are reliably filtered out of the room air. And this without the use of UV-C radiation.

The noise level in continuous operation at 800 m³/h nominal volume flow is below 35 db(A). The Power Diffusor Pro distributes the intake air evenly towards the room ceiling without disturbing draught effects. This ensures the best possible air circulation in the entire interior. The robust, flow-optimised design and the energy-efficient technology guarantee safe continuous operation and low energy consumption.

The air purifier is controlled via a clear display. Here, the room size can be conveniently entered, which automatically sets the optimal performance of the purifier; the air change rate can also be adjusted at any time (a 4-fold change rate per hour is recommended). A weekly schedule can be programmed in the menu and a silent or booster function and an overrun time can be activated. The filter saturation and the room air quality are displayed and the unit can be controlled via a weekly schedule. The air purifier also has a daylight sensor and a timer.


Air purifiers for schools, day-care centres and educational institutions

Politicians, administrators, providers and managers have the goal of keeping schools and day-care centres open despite the Corona pandemic. Teachers, educators, parents and children expect optimal protection. The Blue.care+ mobile air purifier meets all criteria for effectively purifying the air in group rooms and classrooms - even in rooms where ventilation is not possible.

Air purifiers for offices and business premises

Corporate health managers, human resource managers, general managers and site managers are faced with a dilemma: they have to weigh the protection of their employees against the possible loss of productivity in the home office. In some industries, working from home is not even an option.

The Blue.care+ antiviral air purifier offers a safe and inexpensive solution here. Optimally suited for offices and business premises, it meets all technical requirements, is clinically tested and massively reduces the indirect risk of infection.

Air purifiers for practices

Practice owners are responsible for the well-being of their patients and staff. Despite all measures to keep suspected cases of corona as far away from the practices as possible, it cannot be ruled out that infected patients enter the practice premises and thus endanger all others present.


Air purifiers for restaurants, gastronomy and hotels

The operators of restaurants, cafés, ice cream parlours, hotels and the like are also faced with a major challenge: How can guests be effectively protected? And how can economical operation under corona conditions work? The answer is the use of the Blue.care+ antiviral air purifier in hotels and restaurants. With comparatively low purchase costs, strong filtering power and a high air exchange rate, it minimises the indirect risk of infection with corona viruses. The Blue.care+ creates a pleasant and safe room climate for the undisturbed stay of your guests.

What can the air purifier do? How many machines do I need? Here you will find answers to (nearly) all of your questions:

  • Technical data L
  • Technical data M
  • Downloads L
  • Downloads M
  • FAQ

Technical data Blue.care+ (Version L)

Product name Blue.care+ (Version L)
Dimensions 1,68 x 0,73 x 0,56 m
Weight 135 kg
Noise <35 dB(A) - sound pressure level at distance of 1 meter at nominal volume flow rate
Max. air capacity 1.800 m³/h
Air exchange rate Variably adjustable via the touch display. Recommendation according to VDI-EE 4300 sheet 14, the unit should be set to a 4-fold air change per hour.
Power 230 Volt / 50Hz
Consumption at nominal volume flow rate 250 Watt
Filter efficiency ≥ 99.995 % of all particles including bacteria and viruses
Filter combination HEPA H14 multi-filter acc. to EN 1822 or ISO 29463 standard
Version L

Test report on the Blue.care+ air purifier from the Münster university clinic: [download]

Technical data Blue.care+ (Version M)

Product name Blue.care+ (Version M)
Dimensions 1,08 x 0,45 x 0,40 m (with handles and door)
Weight 50 kg
Noise 42 dB(A) - sound pressure level at distance of 1 meter at nominal volume flow rate
Nominal volume flow rate 600 m³/h
Max. air capacity 770 m³/h
Air exchange rate 6 x per hour in a room with a size of up to 50 m²
Power 230 Volt / 50Hz
Consumption at nominal volume flow rate 75 Watt
Filter efficiency ≥ 99.995 % of all particles including bacteria and viruses
Filter combination HEPA H14 multi-filter acc. to EN 1822 or ISO 29463 standard
Version M

Downloads Blue.care+ (Version L)

Original operating manual

Original operating manual

Test report on the Blue.care+ air purifier from the Münster university clinic

Test report on the Blue.care+ air purifier from the Münster university clinic



Downloads Blue.care+ (Version M)

Original User Manual

Original User Manual





FAQ's Blue.care+

Aerosols are generally defined as fine distributions of the smallest suspended particles in a gas; which in our case is air.

The current discussion primarily involves all droplets of various sizes and in various quantities that human beings exhale with the air when breathing and speaking. Due to the force of gravity, larger droplets (> 5 µm) quickly sink downward, on the other hand, small and the minute droplets can remain suspended in the air for a long time. The mixture of these extremely small droplets (in particular suspended matter < 1 µm) and the surrounding air is referred to as an aerosol; the most minute droplets themselves are frequently referred to as aerosol particles – also to differentiate them from larger droplets. In the case of infected persons, these exhaled droplets and aerosol particles contain infectious viruses, which are distributed via the aerosol in the ambient air. In closed rooms, in particular, indirect infection through aerosol transfer is considered an important transmission path [i, ii].

Blue.care+ is an ambient air purifier and has been especially developed for separation of airborne viruses, germs, bacteria, and spores to clean the room air of harmful aerosols in the shortest time possible. This is done by reducing the infection risk. The device does not convey fresh air from outside into the room. However, as is well known, in order to breathe, people need oxygen; moreover it is important that the CO2 exhaled by people does not concentrated excessively in the room. By the way, these correlations apply, wholly independent of the current corona pandemic. Consequently, rooms must also be regularly ventilated, as usual, to maintain good breathing air quality and to supply fresh air to the room.

Our simulations show that when Blue.care+ is properly positioned and adjusted, it can reduce the viral load in a room by 50% within 10 minutes. After 30 minutes a reduction of virus concentration by as much as 90% can be achieved. Given this effectiveness the risk of indirect infection is significantly lowered. To ensure the effectiveness of Blue.care+, it is important that the device's volume flow rate be properly adjusted for the size of the room (see "How high must the air exchange rate be for the air purifier?").

Figure 1: Comparison of the Hengst flow simulation and the measurement at the Bundeswehr University Munich in accordance with [3].

The two factors that are critical for the infection risk due to infectious aerosols in closed rooms are the viral load (i.e. viral concentration) in the room, on the one hand, and on the other hand the exposure time, i.e. the length of stay, i.e. how long a not-yet infected person stays in this room. As the viral concentration and the exposure time increase, the risk of an indirect infection also increases. How the risk can be precisely quantified, and precisely where the limit for an infection lies, are currently the focus areas of very extensive studies that are still underway, for example [iii, iv]. However it is not a simple matter to reduce the length of time people stay in a room, at school, for example, as long as the desire exists to maintain face-to-face classroom instruction. Consequently, air purifiers have the objective to reduce the other critical factor, which is the virus concentration in the room. In this regard see hri-pira.github.io [8], which discusses how the risk of infection can be assessed depending on room size, room occupancy, use of the room, as well as the aeration situation. Blue.care+ is capable of very effectively reducing the concentration of (infectious) aerosol particles in interior spaces. Thus Blue.care+ considerably reduces the risk of an indirect infection through the SARS-CoV-2 viruses and other viruses.

No, the current applicable government agency requirements concerning distancing, mouth/nose protection, etc. are not suspended through use of the device. The combination of the AHA regulation with ventilation and filtration of the circulated constitute the best possible protection against infections.

Various publications point out that the effectiveness of air purifying devices in interior spaces, particularly depends on achieving a sufficiently high air exchange rate. The air exchange rate is the ratio between the volume flow of the device and the room volume (in other words, floor area x height of the room). Studies that cite this correlation include [3, 4]. These studies show increasing the volume flow in relation to the room volume improves the cleaning performance accordingly – the opposite is also true. On the other hand, an ever-increasing volume flow of circulating air in rooms has a negative effect on the well-being of the people in the rooms. In [7], an air exchange rate of 6 is recommended as an effective setting, to ensure adequate purification of the room air. For a room with 8 m x 8 m floor area and a room height of 3 m (i.e. a room volume of 192 m³), the calculation results, for example in a six-fold air exchange rate at a volume flow of 1,152 m³/h.

A HEPA combination filter, filter class H14, as stipulated in standard EN 1822 or ISO 29463, consisting of a specially matched pre-filter and main filter, is used. Pre-filter and main filter are offered as an integrated HEPA H14 filter set for easy handling.

Many sources recommend that mobile room air purifiers should be equipped with high-separation, filter class H13 or H14 filters because only these filters are effective in reducing viruses in the air. One of these sources is the German Federal Environmental Agency (Umweltbundesamt) [v]. In the study conducted by the Bundeswehr University Munich [7], the effectiveness of air purifiers for filtration of infectious aerosols in the ambient air was investigated and use of H14 filters was explicitly recommended.

With regard to their efficiency, air filters can be differentiated in the categories, coarse dust filters, fine dust filters, and high-efficiency submicron particulate air filters. In these categories the high-efficiency submicron particulate air filters, (HEPA filters) are the filters with the highest efficiency. Suspended matter filters are standardized in the norms EN 1822 and ISO 29463. HEPA filters are in the category of suspended matter filters and are used where high cleaning capacities are required, such as operating rooms in hospitals, for example. The abbreviation "HEPA" stands for "High Efficiency Particulate Air" filter.

Due to the effective separating mechanisms, a HEPA filter has a high degrees of separation for virtually all relevant particulate sizes. This is also important, since contaminants in the (breathing) air can have widely varying particle sizes. For example, viruses or smoke particles are significantly smaller than bacteria, and bacteria in turn are significantly smaller than pollen or grains of dust. A HEPA filter is tested for its effectiveness in filtering particles of different sizes. For a HEPA filter to be designated with a specific filter class, it must achieve specific degrees of minimum separation for the particle size that it most poorly separates (the so-called MPPS "Most Penetration Particle Size"). This means that for all other relevant particle sizes, it must achieve even higher degrees of separation than the MPPS. This also applies for particles smaller than 0.1 µm.
The MPPS is usually in the range between 0.1 and 0.3 µm. A class H13 filter must achieve at least a 99.95% degree of separation in MPPS. A class H14 filter must even achieve at least 99.995% in this area. As stated: For all other relevant particle sizes the efficiency in this case is even higher. In addition, the standard prescribes that each individual filter element must be factory-tested for absence of leaks; thus there is a 100% control of the performance of the filter elements. Therefore it can be assumed that in filter elements that have been qualified as H13 or H14 in accordance with the standards cited, virtually ALL particles are actually separated.
The filter set in Blue.care+ meets the rigorous requirements for filter class H14 at the rated volume flow and smaller air quantities.

Use of UV-C radiation has not been sufficiently tested in non-industrial applications. The possibility cannot be excluded that depending on the technology, waste products (endotoxins) occur, which under some circumstances are harmful for humans. Also German Federal Environmental Agency is critical of the use of this technology [8].
Thanks to the HEPA H14 filter, viruses and bacteria are reliably trapped inside the air purifier. In our view additional heating is not necessary because viruses cannot multiply in the filter element and in any case after a relatively short time on porous surfaces they become inactive ("die-off") on porous surfaces. Consequently, we dispense with unnecessary procedures for destroying viruses in the filter; such procedures only consume additional energy without ensuring additional protection.

When used as intended, and for an average use time that does not exceed 40-50 hours a week, the filters must be changed every 6 months. Replacement filters are offered at www.hengst.shop. A shorter or longer service life can also be indicated depending on the room conditions and types of use. According to VDI 6022, a filter change must occur after 12 months, at the latest.

The Blue.care+ device can be opened with the provided control cabinet key. The HEPA combination filter itself is clamped into the housing with two nuts, which can be unscrewed with an off-the-shelf wrench (AF17). In addition, filter replacement is presented simply and with many illustrations in the operating manual.

When changing the filter, you must ensure that dust particles, which can come into contact with the mucous membranes, or that can be inhaled, are not inadvertently released. Bear in mind that during operation, an unmanageable number of contaminant types have collected in the filter during operation. Therefore, precautions are imperative; when changing the filter please wear the appropriate protective equipment specified in the Blue.care+ operating manual. The used filter must be disposed of in a tear-resistant, sealed, plastic bag of suitable size. The original spare part is packed in a bag that is suitable for disposal.
As a rule, the used materials of the filter can be disposed of in the household waste. However, if in doubt, check to ensure whether deviating local regulations are in force.

  • Due to the design, with smaller devices the air exchange rate is significantly lower than the recommended 6x per hour, as a result they are only suitable for very small rooms. See => "How high must the air exchange rate be for the air purifier?".
  • A smaller device outputs the purified air at body height, head height or even near the floor, the draft that occurs is perceived as unpleasant (direct air flow on the body, draft).
  • It is only in a large device that the important HEPA filters have a sufficiently large filter surface to ensure long-term protection without constant filter replacement.
  • To ensure minimal noise, adequate acoustic insulation must be installed, which can only be accommodated in larger devices.
  • For the same reason, in a large device an appropriate high-capacity fan is used, which must not be used to full capacity in the specified rated range of the volume flow.

The Blue.care+ dimensions are: Length 560 x width 730 x height 1,68 mm.
In principle the device can be placed at any point in the room, in the middle of the room, as well as further towards the edge of the room. The air inlet and air outlet should not be directly obstructed or covered, and must have a distance of at least 30 cm to walls. Special considerations may be necessary for special room geometries, such as long hallways, or angled floor plans. The same applies for room dividers or particularly large pieces of furniture, which project into the room, for example: In this regard, particular care is required to select a set-up location for the device that enables uniform through-out the room. However, for very large rooms, or unfavorable floor plans, it may be necessary to use several room air purifiers. If there is a joist in the room, it may be effective to set up the device directly on top of it, see => "I am using several Blue.care+ units, what is the best way to distribute them in the room?".

Figure 2: Different cleaning capacity in two rooms that are separated by a double door: Red: Cleaning capacity in the room without device / green: Cleaning capacity in the room with device / gray: Mean value of the cleaning capacity

The special structural shape of the Blue.care+ with its specifically developed design, ensures uniform, room filling ventilation with filtered air. To achieve adequate cleaning capacity, first and foremost the right air exchange rate is significant, see => "How high must the air exchange rate be for the air purifier?" Placement must be carefully planned, see => "How much space does Blue.care+ require and where should I place the device?"

We have developed and designed Blue.care+ for fully occupied classrooms, offices, or restaurants. The simulations clearly show that the function is not restricted through a table, chairs or even people, for example. This is also substantiated in practical measurements, which have been undertaken by the Bundeswehr University Munich [7], for instance. If there are no objects that directly cover the Blue.care+ unit, the function is not restricted. Placement must be carefully selected (see "How much space does Blue.care+ require and where should I place the device?").

This is particularly the case, if you want to equip a very large room or a room with angled geometry, such as an L-shaped floor plan.
In this case the devices should be set up so that they are spaced several meters apart. And they should be placed in such a manner that each device is "responsible" for purification of one part of the room. Ideally you will determine the ideal placement by imagining that you are dividing the room into two halves with a partition wall, and then appropriately placing the device in the respective half of the room.

Thanks to stable casters and the device height of 1.95 m, which allow passage through all normal doors and elevators, the robustly constructed room air purifier can be quickly and easily moved to a different location.

The Blue.care+ antiviral air purifier is delivered pre-assembled and equipped with a HEPA H14 filter set; commissioning requires only a few hand motions. The cold appliance plug must be plugged into the device and into a standard 230 V electrical outlet. You must switch the device on via the ON/OFF switch. The room size can be entered via the easy-to-use display and the unit automatically sets the correct volume flow.

No, placing the Blue.care+ in service while the room is in use is fully sufficient. The Blue.care+ L air purifier has a booster function that automatically switches on a fixed maximum output. A daylight sensor can also be switched on, with which the device automatically switches off in the dark.

The device is designed for continuous operation, and thanks to the robust construction this is possible with no problems.

  • Blue.care+ antiviral air purifier with integrated HEPA H14 filter set
  • power connection cable
  • key for the maintenance hatch
  • operating manual

The Blue.care+ is delivered on a pallet, completely assembled and ready for operation; it can be further transported on this pallet. After unpacking, thanks to the casters, one person can easily push the device to its destination.

The Blue.care+ is CE-conformant and has the appropriate certification.

At rated capacity with a volume flow of 800 m³/h, i.e. at the setting for a room size of 80 m², the sound pressure level at a distance of 1 m for the Blue.care+ L is 34 dB(A) (May 2022).

Blue.care+ L: Sound pressure and sound power levels for the air purifier variants

Blue.care+ M: Sound pressure and sound power levels for the air purifier variants

i. Hartmann, Anne; Kriegel, Martin (2020): Parameterstudie zur Risikobewertung in Innenräumen durch virenbeladene Aerosole. Technische Universität Berlin.

ii. Morawska, L.; Milton, D.K. (2020): It is time to address airborne transmission of Coronavirus disease 2019 (Covid-19). Queensland University of Technology, Brisbane, Qld, Australia and University of Maryland School of Public Health, College Park, Maryland, USA.

iii. Müller, Dirk; Rewitz, Kai; Derwein, Dennis; Burgholz, Tobias M. (2020): Vereinfachte Abschätzung des Infektionsrisikos durch aerosolgebundene Viren in belüfteten Räumen. RWTH Aachen.

iv. Buonanno, G.; Morawska, L.; Stabile, L. (2020): Quantitative assessment of the risk of airborne transmission of SARS-CoV-2 infection: prospective and retrospective applications. University of Cassino and Southern Lazio, Cassino, FR, Italy and Queensland University of Technology, Brisbane, Qld, Australia.

v. Umweltbundesamt (2020): Infektiöse Aerosole in Innenräumen. https://www.umweltbundesamt.de/themen/ gesundheit/umwelteinfluesse-auf-den-menschen/innenraumluft/infektioese-aerosole-in-innenraeumen. Zuletzt eingesehen am 14.10.2020

7 Kähler, Christian J.; Fuchs, Thomas; Hain, Rainer (2020): Können mobile Raumluftreiniger eine indirekte SARS-CoV-2 Infektionsgefahr durch Aerosole wirksam reduzieren? Universität der Bundeswehr München. Strömungsmechanik und Aerodynamik. https://www.unibw.de/lrt7/raumluftreiniger.pdf

8 https://hri-pira.github.io

Do you have questions? We will be glad to assist you:

The advantages of the Blue.care+ air purifier

  • The HEPA class H14 combination filter effectively removes ≥ 99.995 % of airborne viruses and aerosols.

  • Fine dust, allergens, bacteria as well as the smallest viral contaminated aerosol droplets are reliably filtered out of the room air.

  • Without the use of UV-C radiation.

  • Reduction of the viral load by >90 % after 30 minutes (room size 80 m²). At an air exchange rate of 6 times per hour.

  • The noise level in continuous operation at 800 m³/h nominal volume flow is <35 db(A) (as of October 2022).

  • The Power-Diffusor Pro distributes the intake air evenly towards the room ceiling without disturbing draught effects. This ensures the best possible air circulation in the entire interior.

  • The robust, flow-optimised design and the energy-efficient technology guarantee safe continuous operation and low energy consumption.

  • Made in Germany.

Effectiveness proven in independent tests.

The Blue.care+ features HEPA filter class H14 and a nominal volume flow rate of 1,150 m³/h. In practical tests by an accredited independent test lab, this achieves particle reduction between 94 and 95 % in reproducible conditions. These tests are based on a relevant particle size of 0.5 µm. The Blue.care+ [test report] is therefore a proven aid in reducing the risk of corona infection.

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