One of the most important aspects in terms of technology in air-purifying equipments are their filters. The filtering system, along with other characteristics, determine the efficiency and effectiveness of the equipment. Currently, Zonair3D has the most advanced technology available in the market and therefore offers highly efficient filters with international approval.
In order to determine the quality between equivalent filters produced by different manufacturers, there are two basic parameters to consider: the dust holding capacity and filter efficiency.
Dust Holding Capacity: it will determine the operating life of the filter. It is measured by the weight of the powder that the filter retains during its entire lifetime, ie, the filter that under the same conditions of use retains a greater amount of powder will have more durability.
Efficiency: The efficiency of filtering determines the quality of the filtering considering the amount of dust retained by the filter and the amount that passes through. The less powder passing through, the best filtering efficiency.
Also, when the user has two efficiency equivalent filters, it is essential to know the type of test and regulations under which they have measured the efficiency, and also the kind of powder that the test has been performed with.
1. Arrestance test: done with artificial powder, determines the weight percentage that the filter retains of the total dust thrown.
2. Dust Spot Efficiency: consists of passing untreated atmospheric air and determines its efficiency by the ability to prevent a surface stain.
Finally, in order to standardize efficiency filter testing, the American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) has designed the ASHRAE standard 52-76 with the purpose to determine the efficiency of filter type ‘Arrestance’ and ‘Dust Spot Efficiency’. It features the procedures and dust characteristics to be used in the tests.