Unlike hepa air purifiers, which draw room air through high-efficiency particulate filter media, anti-dust mite devices target dust-mite allergen reservoirs using mattress and pillow encasements, humidity control, hot washing, high-efficiency vacuum containment, or other defined methods rather than directly treating asthma or allergy.
The useful distinction begins with different mechanisms. For anti-dust mite devices, examine mite reservoir and encasement; for hepa air purifiers, examine hepa media and clean-air delivery. Specifications help only when the task has been defined.