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HEPA air purifiers provide the ultimate levels of protection for your home, school or business – removing 99.7% of airborne particle matter including dust, mould and allergens.
HEPA is an acronym for ‘high efficieny particular air (filter)’. Air purifiers featuring a HEPA filter can theoretically remove 99.97% of all airborne particles to a minimum size of 0.3 microns. For context, 0.3 microns is 0.0003 millimetres!
HEPA filters are typically made from extremely fine strands of plastic or fibreglass woven together. The openings between these strands are less than 0.5 microns in size – large enough to allow air to pass through whilst capturing all airborne contaminants via direct impaction, diffusion and interception.
HEPA filtration can be incorporated into air purifiers with other types of filters including charcoal, UV filters, carbon and ionisation to provide maximum removal of and protection from microscopic allergen, smoke, bacteria, viral and other particles.
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Some concerns have been raised about possible shedding of microscopic fibres from HEPA air purifiers filters into the air that we breathe. However, an in-depth scientific study found that whilst a miniscule amount of particles can be shed from HEPA air purifier filters, this was at an amount 35 times less than the air we breathe everyday.
The lifespan of your HEPA filter will depend on a number of factors including usage amount and air pollution levels. Most manufacturers will provide recommended lifespans for their HEPA filters based on their own testing.
HEPA air purifiers have been shown to be effective in removing 99% of aerosols from a single room of a hospital ward within 5.5 minutes. Beyond respiratory aerosols and bacteria, HEPA air purifiers are also considered to be effective for the removal of dust, pollens, mould spores, smoke and other allergens.
Typically, mould spores are 3 to 40 mircons in size (0.003 to 0.04 millimetres) – HEPA air purifiers are effective in capturing particles down to 0.3 microns – meaning they are able to remove airborne mould spores.
HEPA air purifiers alone aren’t effective in removing odours, gases or chemicals from the air.