Polyester and Fiberglass Air Filters Media

This paper deals with ASHRAE filters used in air filtration applications and summarizes, on the basis of current research work, some of the reasons for the disagreement that exists among filter manufacturers concerning the properties and performance of various types of air filter media in general, glass and synthetic media in particular. Attention is also drawn to some important items that need to be incorporated in test methods and to some factors that could be affecting filter performance

Filter Media Classification The classification of filter media depends on the test method used. As most testing is performed in the laboratory with synthetic dust, the classification does not always provide a reliable basis for the estimation of a filter`s life or its performance in actual application. According to the European Classification, particle filters are categorized into four types: Course, Fine, High Efficiency Particulate Air Filters (HEPA), and Ultra Low Particulate Air Filters (ULPA). Filters produced from glass fibers or synthetic fibers like polyester, acrylic and polyamide fibers, which separate particles that are 5mm and larger, are designated as course filters. Fine filters are made mainly from glass fibers with an average diameter of 0.5 - 5.0 mm or from coarse plastic fibers, often in combination with an electrostatic charge.

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