IQAir HyperHEPA Replacement Filter [Medical-Grade Air] Allergies, Pets, Asthma, Odors, Smoke, Pollen, Dust; Swiss Made Proven medical-grade air filtration: 100x more effective than HEPA air purifiers Only IQAirs exclusive HyperHEPA filters stop ultrafine particles (down to 0.003 microns) Stops the smallest particles that exist: 10x smaller than a virus Eliminates fine & ultrafine particles, including viruses & vehicle exhaust particles CFC-free materials are safe & environmentally friendly