The Eureka WHF-5 is a washable HEPA exhaust filter for 5700 and 5800 series upright vacuums. HEPA-level filtration captures particles down to 0.3 microns in the exhaust airstream. The filter is washable and reusable: rinse with water and allow to air-dry completely before reinstalling. Replace when the filter can no longer be cleaned to restore airflow.