HEPA - High Efficiency Particulate Air : Filter captures 99.97% of airborne pollution, allergens, smoke and odours, which can cause breathing difficulties. The HEPA Filter has 5 stages to purify and revitalise the air. Stage 1 Pre-Filter: Collects larger-sized particles in the air such as pollen and hair. Stage 2 Multi Filter Cartridges (2) Multi Filters (white): Remove 99.97% of airborne particles 0.3 micron or larger. Stage 3 Multi-catalyst filters (grey): Absorb and decompose odours. Stage 4 Active Carbon Filters (black): Remove smoke and odour. Stage 5 Ioniser: Release negative ions to remove airbourne contaminants (such as smog, pollen and dust).DetailsStage 1 Pre-Filter: Pre-Filter collects larger-sized particles in the air such as pollen and hair.Outer Box Width (cm) 20Outer Box Height (cm) 10Outer Box Length (cm) 5Net weight (kg) 0.13Gross Weight (Packaged) (kg) 0.13Item priced per 1Outer box quantity 1