The Riccar B623-0000 is a foam exhaust filter for Riccar 7000 and 8000 series upright vacuums, including the R8920. Positioned at the exhaust stage, this filter captures fine dust and debris before air exits the machine, protecting air quality and extending motor life. The foam construction is washable; rinse with clean water and allow to dry completely before reinstalling. Replace when foam shows deterioration or when suction noticeably decreases.