Products & Services

NanoCleanAir offers extensive consulting, engineering, development and measurement services in the field of analysis, measurements and flow simulations of virus and nanoparticles in the air we breathe indoors. The broad scientific know-how of NanoCleanAir as well as the team's decades of international experience in aerosol technology and the understanding of biological processes caused by nanoparticles ensure professional competence and well-founded services.

In 2020 it could be shown experimentally that filter media, which are used in the exhaust gas with a focus on the size range 10-500 nm, are very well suited for the efficient cleaning of viruses from the air we breathe.

The Nanocleaner® filter system (left picture) was developed to clean the air inside vehicles. The vehicle's own ventilation is switched entirely to recirculation, around 10% of the air circulated with it is supplied from outside through the filter. After a few minutes, the air inside the cabin is practically free of particles (right picture). Soot particles are separated with an efficiency of 99%.

In order to be able to test filters for their efficiency in separating aerosol particles, but also viruses, a test stand was developed.

Design criteria for the test bench:

• Measurements with aerosol particles and viruses or bacteriophages should be possible.
• The dimensioning so that the test stand is suitable for a flow of around 10 - 100 m3 / h.
• Viruses are introduced into the system via a nebulizer.
• Viruses are collected on gelatin filters for subsequent evaluation.
• The dwell time should be long enough that the droplets generated by the nebuliser have evaporated before they reach the measuring point at the filter inlet.
• The dimensions of the entire test stand are such that there is space for it in a laminar flow chapel.
• The test stand should be easy to clean with alcohol.
• The structure can be modular in order to be able to use different filter types.

Principle diagram of the filter test bench:

At the test stand entrance, aerosol is either supplied from the outside or generated with the attached nebuliser. In the subsequent stretch, the droplets can evaporate before a nebuliser ensures that the aerosol distribution is homogeneous. A first sampling point is provided in front of the filter to be tested. The main air flow is generated by a fan behind the filter, followed by a second sampling point.