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Electrostatic Air Filter Theory of Operation

The electrostatic air filters manufactured by Dust Free. utilize synthetic material which develop an electrostatic charge as friction is applied to the plastic fibers. This can be demonstrated by rubbing the surface of the filter with a cloth briskly and placing the filter over light weight flakes of material such as tea leaves, or styrofoam chips. The small chips will be attracted to the filter surface and held there due to the charge that developed on the filter as a result of rubbing it. In like manner, it is believed that a charge of much smaller strength is developed as air passes through the filter, increasing the filters attraction to microscopic particles such as pollen, molds, and dust.

This theory was introduced approximately twenty years ago, but was never developed further because of the introduction of powered electronic precipitators which are more effective on particles in the submicron ranges such as cigarette smoke. The renewed interest in "non-powered self-charging" filters began approximately 10 years ago as various manufacturers started making products of this type for the residential allergy market.

The theory of self-charging electrostatic air filters is still new and will be further developed as research is continued to better understand the various electrical characteristics of these materials and how their effectiveness can be increased.

 

Copyright 1998 ERAMCO, Inc.  Dust Free is a registered trademark of ERAMCO, Inc.
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