I bought this hoping it was a suitable replacement for my Dyson. The pre filter does not seal and in fact fits so poorly it actually falls out. I have no way to test the post portion, the Hepa art of this filter but my guess is it is just as bad. The only thing I can say about the post filter is that it did actually fit.
Fake took dyson to the store under warranty still but not close to us because it was having issues my husband tried to order parts to avoid having to make the drive x 2 to drop and pick up but it continued to have trouble. The tech said this filter doesn’t work and it’s not a real dyson product she said it should say dyson on the outside and the inside which most only say on the outside if fake