Strategy for measuring the collection efficiency of HVAC, HEPA and ULPA filter media and cassettes for nanoparticles down to 5 nm

C. Asbach*, W. Mölter-Siemens, A. M. Todea, IUTA Duisburg; A. Schmitz, F. Schmidt, University Duisburg-Essen, Germany

Airborne nanoparticles can cause adverse effects. They can be easily inhaled and deposited in the gas exchange region of the lung and trigger severe health effects. The latest generation of computer processors is manufactured with structure sizes of only 14 nm, hence even very small nanoparticles can negatively impact the manufacturing in cleanrooms.

Especially in urban areas, a large fraction of nanoparticles stem from industry and traffic exhaust and may enter indoor environments through HVAC systems. Typically, the number concentration of nanoparticles in the (urban) air is orders of magnitude higher than the concentration of micron sized particles. Still, current standards for the evaluation of HVAC filters (e. g. EN 779) only prescribe the determination of the filtration efficiency at a particle size of 400 nm. It is known that the filtration efficiency increases for particle sizes below the MPPS. High upstream nanoparticle concentrations are therefore required in order to produce statistically secured data downstream of the filter.

In the present work, we investigated the efficiency of both the filter media as well as the assembled full size HVAC filter cassettes...

Session: G14 - Filter Testing
Day: 13 October 2016
Time: 13:00 - 14:15 h

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