Air Commander electrostatic air filters are 10 times more efficient then the standard disposable filter. By switching to a permanent electrostatic furnace filter, the air inside your home will be cleaner and fresher. Our furnace filters are electrostatically charged to trap up to 94% of the dust and allergens in your home. Just easily wash the filter every 1-3 months and put it back in place. The sturdy metal frame will stand the test of time. With a lifetime warranty and 100% money back guarantee, why not make the switch to a permanent air filter? Electrostatic Air Filters clean the air by using static electricity, a safe, naturally occurring phenomenon. An electrostatic charge is generated by air flowing through a maze of static prone fibers. Airborne particles are attracted and held by the static charge until released by washing. All Air Commander Electrostatic Air Filters contain an EPA registered anti-microbial material to inhibit mold and bacteria growth on the air filter surface.