Filters
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An air purifier draws surrounding air into the unit using a fan, passes it through one or more filters to capture airborne contaminants, then releases the filtered air back into the room. Depending on the filter system, it may capture dust, pollen, pet dander, smoke particles and other fine airborne pollutants.
HEPA stands for High-Efficiency Particulate Air. HEPA filters use a dense filtration material designed to capture very small airborne particles, including dust, pollen, mould spores, pet dander and fine smoke particles. A quality HEPA filter can capture approximately 99.95% of fine particles under relevant test conditions, making HEPA filtration particularly useful when selecting an air purifier for allergens and particulate pollution.
CADR stands for Clean Air Delivery Rate. It measures how much filtered air an air purifier can deliver, usually with separate ratings for particles such as smoke, dust and pollen. Generally, a higher CADR means the purifier can clean the air faster and is suitable for a larger space. CADR is therefore an important specification to compare when matching an air purifier to a room or office size.
They can. An air purifier fitted with a HEPA filter can reduce airborne allergens such as pollen, dust, pet dander and some mould particles, which may help reduce exposure to common allergy and hay fever triggers. However, an air purifier works best as part of a broader approach that also includes regular cleaning and controlling the source of allergens.
An air purifier may help some people with asthma by reducing airborne triggers such as dust, pollen, pet allergens, smoke and fine particulate matter. Studies of portable HEPA air cleaners have found improvements in some asthma or allergy symptoms, although results vary and air purification should not be considered a replacement for medical asthma management or eliminating pollutant sources. Asthma Australia recommends choosing a HEPA-filter air purifier and avoiding ionising systems that can produce ozone, which may irritate the lungs.