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Electrostatic air filters are affordable washable and are much more effective than traditional pleated filters. Some even call washable air filters permanent filters. Are Electrostatic Filters Better See The Pros Cons Simply The Best A well-constructed washable electrostatic air filter is designed to last often longer than the HVAC system itself. Electrostatic furnace filter . Inside the furnace you should see a filter. Electrostatic polypropylene is manufactured from non-porous filament which wont absorb or retain environmental moisture and is impervious to mold bacteria and fungi. 3M Disposable Electrostatic Central Furnace Filters. Electrostatic air filters also known as washable filters or reusable filters are located on a furnace and typically take the place of a pleated filter. An electrostatic air filter is a type of furnace filter. Theres a debate about which type of furnace filter is better for your HVAC system. Lifetime Silver Series Electrostatic Furnac