Aspects of air filter testing: dust loading

M. Stillwell*, Particle Technology Ltd, UK

Test standard ISO 16890:2016 (Air Filters for General Ventilation) is now used in the filtration industry to classify the performance of air filter elements in terms of their particulate removal efficiency (ePMx), initial arrestance and test dust capacity. This applies to filter elements used in heating, ventilation and air conditioning systems (HVAC).

Eurovent is the European industry association for HVAC filters. Their sub-unit, known as Eurovent Certita Certification, has a certified performance scheme for participating filter manufacturers. The performance data is collected by approved independent test laboratories and is used to verify the claims made by the filter manufacturers. This helps those who need to specify air filters for certain applications to select with confidence the most appropriate type of air filter.

The measurement of air flow resistance of a filter element is very important because this data is used to determine the energy rating of the filter. The 3rd edition of Eurovent document 4/21 (2018) describes the test method and calculations. It is based on the dust loading test specified in ISO 16890:2016 part 3, except that it requires a minimum of eight separate dust loading stages, including the initial dust loading of 30 grams (or the quantity of dust required to produce a 10 Pa rise in differential pressure) and the final target pressure drop, which is dependent upon the filter type. The average pressure drop across the filter is determined and then used to calculate the annual energy consumption (kWh/year). Eurovent’s rating standard RS 4/C/001-2019 specifies the energy rating classes based on the annual energy consumption and the ePMx rating of the filter.

The rate at which the differential pressure increases across a filter with respect to the quantity of dust fed to the filter depends upon the physical properties of the test dust. One aspect of interest in this work is the significance of electro-static charges within the aerated dust on the measurement of differential pressure. The results from tests using Particle Technology’s accredited ISO 16890 test rig, with industry standard equipment will be discussed...

Session: G7 - Filter Test Systems I
Day: 23 October 2019
Time: 13:00 - 14:15 h

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