Allergen Filtration
A marketing umbrella term for filtration sufficient to trap common household allergens (dust mites, pet dander, pollen).
Allergen filtration can mean true HEPA, HEPA-type, or simply 'pretty good.' For asthma or severe allergies, look for the actual specification (HEPA 99.97% at 0.3 microns) and a sealed system, not just the label.