Hoover Replacement HEPA Filters for Hoover Self-Propelled WindTunnel Filter.

• Fits original manufacture part numbers below: 40120101, 3613021, 43613-022, H-40120101, H-43613021, STR42651

• For optimal performance change filter when it becomes full of dirt and dust; about every 6 months.

• PERFECT FIT - Poor-fitting filters can cause dust and debris to escape from your vacuum cleaner. This replacement filter has an exact fit and multi-layer technology to prevent leakage.

• SUPERIOR FILTRATION - Keep your home free from irritants and airborne allergens. This HEPA vacuum filter is designed to trap harmful particles, such as pollen, pet dander, and dust mites.