The filter is Hoover part number 40120102 and is the same filter as 43613024and fits Hoover WindTunnel V2 / Dual V / Savvy bagged models HEPA final (1 pack).
This filter is used when the vacuum is configured for use with paper bags. (foam filter #38766028 is used if your vacuum is bagless.)
Frame of filter measures 6 1/8"" x 5 3/8"" x 1 1/4"".
Fits all bagged WindTunnel V2, Dual V and Savvy upright vacuums including U8120900, U8140900, U8153900, U8155900, U8161900. Does not fit bagless models.