Actual filter size may differ from size shown in image.
NaturalAire Electrostatic Washable Custom Size Filter
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The Naturalaire Electrostatic washable furnace filter is a passive electrostatic air filter. It uses a special combination of media to electrostatically charge airborne particles and pull them from the airstream. But it does not rely on external power supply to create that attraction. Instead, the friction of air passing over the special synthetic filter components causes the electrostatic attraction to occur naturally. Because no external power supply is needed, the Naturalaire Electrostatic is a fast, easy and economical upgrade from ordinary spun glass filters. It is available in all of the most common face sizes, 1" depth and 2" depth, as well as almost any special size.