The HEPA (High Efficiency Particulate Air) filter is a high efficiency filter that captures up to 99.97% of particles 0.3 micrometers and larger. These filters are ideal for allergy sufferers and those with dust sensitivities as they remove fine dust particles, allergens, pollen and other contaminants from the air. HEPA filters are commonly used in vacuum cleaners, air purifiers and other equipment where a high level of filtration is required.