Hoover Windtunnel Air Washable Primary Filter, Part 303903001
The primary, washable filter assembly for the Windtunnel Air models is located inside of the top of the dirt bin. Once the dust bin assembly is removed from the vacuum cleaner, twist the lid/handle to expost the primary filter. Pull the tab on the filter to remove it from the dust bin. Rinse the filter under warm water, until the filter no longer is visibly dirty. It's VERY IMPORTANT that this filter be air dried for at least 24 hours before reinstalling it into the vacuum for use. Many people puchase a spare filter to use while one is drying. It's recommended that this filter be cleaned at least every 30 days, or if the vacuum suddenly looses suction. This is a genuine Hoover made filter, part number 303903001 designed to fit the Hoover Windtunnel Air Lightweight Bagless Upright model UH70400.