This is a device that attaches directly into the HVAC ductwork, feeding your whole house. As the name implies, this is an electronic filter not a folded mesh encased in a cardboard frame like a typical air filter. It works by placing a negative electric charge on airborne particles and a positive electric charge on the media. As opposites attract, it collects airborne particles like a magnet. To give you some perspective, typical air filters remove particles down to about 750-1000 microns in size, or about the size of the eye of a sewing needle. But, an electronic air cleaner can remove particles less than 10 microns in size a size so small it would require an electron microscope to see! Particles of this small size stay suspended in air easily and account for 99% of the total number of particles in unfiltered air. Please give us a call at 619-512-6212