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TNO Report Reduction of fine and ultrafine concentration in a nursery (PDF, 2.56 MB)

“In order to investigate the extent to which it is possible to improve air quality in the day-to-day practice of a daycare center, a new low-pressure fine dust filter (VFA ASPRA XS) has been tested in a childcare center in Delft under the “Fresh Childcare” technology cluster. The pressure drop of the filter was 30 Pa, which is very low relative to conventional F9 filters (250 Pa) and HEPA filters (500 Pa). […]

The smaller dust particles, PM2.5 and PM1, are overall coming from outside. Application of the air purifier on the inlet results in a 66% decrease in PM1 infiltration, and 68% for [PM2.5-PM1] in the bedroom, a reduction of factor 3 relative to a comparable room without air purification. This is a lot better than the performance of other systems in a similar study [30], proving that an air purifier can also significantly reduce the concentration of fine dust in the day-to-day practice of a daycare center.”

TNO Report Enotoxins and Effectiveness ASPRA Air Purification (PDF, 2.12 MB)

“The goal is therefore to get an impression of the effectiveness of a number of filter classes on the reduction of endotoxins with a limited amount of measurements. […] Near the sorting machine, 3 air filters with filter classes G4, F7 and F8 and an electrostatic filter (ASPRA) have been tested for particle and endotox capture. […] The electrostatic filter had the highest yield efficiency with respect to dust particles.“