Review on Fette Filter - High-Efficiency Pre-Motor and Post-Motor HEPA Vacuum Filters Compatible with Dyson DC14. Compare to Part # 901420-01, 905401-01, 923480-01. (Combo Pack) by Michael Caldwell

Replaced filter and everything seems to be working. I was concerned that the HEPA filter would not fit on the underside of my DC14 Animal, but it turned out to be the right size. Just make sure when you attach the foam gasket that you make it slightly larger than the size of the filter so it's really tight and you don't lose suction.