I lost the Final filter from my Hoover Wind Tunnel sometime in the last 3 years. I went to the hoover Web site to find the part number, and lo and behold.. it was on Amazon for half the price. I got it, it fits, the packaging that arrived was the same that you see in the picture. Works great.
I would really like to know how often you have to replace these.
FYI; mine is a wind tunnel, not self propelled model# U5720-990 (written on the bottom of the Vac, near the rotating brushes)