Filtering out dust, pollen, mould spores, cigarette smoke & a whole range of other undesirable airborne particles, Fellowes HEPA Aera Max Filters are perfect for ensuring quality air. Stopping 99.7% of all particles & catching impurities as small as 0.3 microns, you have a more reliable way of preventing disease. Perfect for people that are suffering from respiratory diseases such as asthma & bronchitis.