For allergies, consider HEPA (High Efficiency Particulate Air) filters, which capture 99.97% of particles as small as 0.3 microns, including allergens like pollen, pet dander, and dust mites. Look for filters with a MERV (Minimum Efficiency Reporting Value) rating of 13 or higher, as they trap smaller particles and offer enhanced filtration. Additionally, consider activated carbon filters to neutralize odors and VOCs (Volatile Organic Compounds) for improved indoor air quality and allergy relief. Regular filter replacement ensures optimal performance and allergy relief.