The unequaled IQAir's patented HyperHEPA filter eliminates fine and ultrafine particles, including bacteria, viruses and highway exhaust soot. HyperHEPA technology will filter particles 100 times smaller than what ordinary HEPA is capable of capturing. IQAir's HyperHEPA Filter captures 99.5% of ultrafine particles down to 0.003 microns. Ultrafine Particles (particles between 0.1 microns and 0.003 microns) are small enough to pass right through the membranes of the Alveoli in your lungs and right into your bloodstream. These are the most dangerous particles in the air we breath.