What Is an Electrostatic Air Filter?

The most common type of furnace and central air conditioning filter is the paper or fiberglass filter, an inexpensive product that is available in plain or pleated form. These filters trap larger particles, but do little about allergens or minute particulates. Electrostatic air filters, in contrast, are more effective at removing these smaller materials.

Static Electricity

Electrostatic air filters contain synthetic fibers that create a static electric charge to attract particulates.

Minute Particles

These filters are designed to trap not only larger dust particles, but also bacteria, dust mites, mold spores, pet dander, pollen and more.

Disposable or Reusable

Electrostatic air filters can be purchased in either disposable or reusable types. Disposable ones should be replaced every three months, while reusable filters can be washed with a garden hose several times before replacing.

Filtering Quality

Depending on the brand and filtering level, an electrostatic air filter collects up to 35 percent of minute particulates, and over 90 percent of allergens and dust particulates, according to various manufacturer websites.

Kits

Some electrostatic air filters can be purchased with a permanent frame and replaceable filter.

Price

As of 2009, the more inexpensive paper or fiberglass filters generally cost under $10, while electrostatic air filters cost anywhere from $15 to $100, depending on the filtering quality and reusability factor.

Resources

• Further information on electrostatic air filters