Answers to frequently asked questions

1. FAQs concerning the room

The ideal installation height of the CUBUSAN is approx. 1 to 2.5 meters to installation level (base edge of unit). The placement within the room is of secondary importance, but we would recommend positioning the device in the middle of the room to be protected – provided that the necessary safety distance of 1 m to the CUBUSAN can be guaranteed.

Due to the flow and diffusion of the plasma in the air, a uniform distribution of hydroxyl radicals is achieved after approximately 15 minutes per CUBUSAN for a room with a maximum volume of 120 m³. However, the CUBUSAN should always be activated one hour before multiple people enter the room.

Yes, but for rooms with high ceilings the cubic volume of the room is decisive for calculating the required number of CUBUSAN units – e.g. CUBUSAN CP-120  (room volume / 120 m³ (rounded up) = number of CUBUSAN CP-120 required). For large, high rooms with ventilation systems, the situation must be assessed individually and the manufacturer should be contacted.

The ions/hydroxyl radicals have an activity period of up to one hour.

2. FAQS concerning safety

When operating the CUBUSAN, a very low ozone value is generated, which is, however, far below the maximum permitted limit value. For safety reasons, a minimum distance of one meter from the device should nevertheless be maintained when people are present for a longer period of time. This ensures that the small amount of residual ozone emitted by the CUBUSAN is diluted to such an extent that it poses no danger to humans or animals.

No, hydroxyl radicals are the “washing machine” of our atmosphere and are measurably present in high numbers next to a waterfall with sunshine or thunderstorms, for example. Cold atmospheric plasma produced by the CUBUSAN has also been used very successfully in medical wound treatment for several years now.

The cell membrane has a different structure in the cells of higher organisms (eukaryotes, including plants and animals as well as humans). This means that hydroxyl radicals have practically no negative effect on eukaryotic cells and that humans are not at risk from exposure to hydroxyl radicals.

Electrical machines and motors may create ozone as a by-product during operation (for example, a transfer drum in a copier). The values measured for CUBUSAN amount to 0.01 – 0.04 ppm directly at the upper discharge opening, which can be assessed as very low. At a distance of one meter to the device, the ozone is so heavily diluted that it can no longer be detected. A daily average of 0.10 ppm is prescribed as the occupational exposure limit (OEL value) in Austria and Germany.

The nitrogen oxide (NOx) value in a closed room is below the measuring limit when the CUBUSAN is in continuous operation. The EU limit value is 40 µg/m³.

No. A high degree of antimicrobial efficacy is noted; at the same time, the hydroxyl radicals have absolutely no detrimental effect on higher organisms and humans. On the contrary, contact with cells of higher organisms causes the radicals to decompose catalytically to water.

NO, the CUBUSAN needs to be viewed as a component of a complete hygiene concept. All valid national government guidelines and provisions on the topic of hygiene should naturally continue to be observed. Sneezing hygiene and hand washing, distancing, ventilating, and so on, should continue to be implemented.

3. FAQs concerning the function

Yes, viruses are neutralized by hydroxyl radicals regardless of mutation.

The test bacterium Enterococcus faecium is recommended by the DGHM (German Society for Hygiene and Microbiology) and has been used for decades in the field of disinfection analysis, as it is much more resistant than a large number of known bacteria and viruses and also has a low level of human pathogenicity (harmfulness for humans). The test bacterium Enterococcus faecium is therefore to be regarded as representative of all enveloped viruses and bacteria in the RKI A+B* categories (Robert Koch Institute, Germany).

The efficiency of up to 99.99 % can only be achieved with a room temperature of 18-24 °C and a relative humidity of 30-60 %. A minimum humidity (rel.) of 10 % is required for hydroxyl radicals to be formed in sufficient numbers. The room volume of 120 m³ per CUBUSAN unit must not be exceeded.

Reactions are limited in absolutely dry air, because water vapor content is necessary for the formation of hydroxyl radicals

With its STEREX plasma technology, the CUBUSAN is effective not only against enveloped viruses* and bacteria, but also against molds and pollen, making it a very useful instrument for improving quality of life, particularly for allergy sufferers.

Yes, the STEREX plasma technology is also successfully used in WINTERSTEIGER’s DRYTECH range. In this range, in addition to disinfection, strong unpleasant odors are also very greatly reduced or neutralized within a short period of time.

Hydroxyl radicals have the property of breaking down hydrocarbons (for example fatty acids) after prolonged exposure. Therefore, the CUBUSAN not only neutralizes odors and the causes of odors (excretions of bacteria, which are eliminated by the STEREX plasma technology), but also decomposes the fatty acids in the aerosols.

The plasma source is not subject to wear under normal use in the specified conditions.

No, provided the device is operated within the prescribed environmental parameters.

NO, however, after 25,000 hours of operation the unit must be inspected, as the plasma source may become contaminated and must then be professionally cleaned. With daily 24-hour continuous operation, this corresponds to a running time of just under 3 years or, when used during normal office hours, a usage of approx. 7 years.

If the device is used differently than prescribed, for example in rooms with heavy soiling, insect infestation, excessive humidity, or very high dust loads, the device must be checked continuously for plasma performance.