My self propelled wind tunnel is over 10 years old and I still use it for my indoor area and screened in patio. It originally used standard Y-type vacuum bags and a plastic pleated HEPA filter (Hoover P/N 40120101) which has been getting harder and harder to find lately and now I know why. The latest wind tunnel vacuum I bought (Hoover WindTunnel Anniversary Upright Vacuum, Self-Propelled, Bagged, U6485900) has the same mechanical design as my old one, but uses a HEPA bag (Hoover part number 902419001) and this latest filter . So all I had to do was swap out my old wind tunnel for a new HEPA bag and the last filter and now it works just like the new one.
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