Charged Media


Charged Media Air Filters also rely on straining, impaction, and static electricity to collect particles.  Charged media filters use an external, direct current (dc) voltage source to generate the electrostatic field.  Charged media filters are made of fibre glass or cellulose fibres, which can pick up an electrostatic field when a high dc voltage is supplied.
 
Unfortunately, charged media filters share the same weakness as self-charging filters.  The strength of the electrostatic field is insufficient to polarize most particles and the media is too thin for effective straining and impaction.


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