Hi @Beckitha,
Welcome to the Dyson Community!
Your Dyson V11 vacuum has a washable filter unit engineered to last the lifetime of the machine in normal use. The fully-sealed, six-layer filtration system traps 99.99% of particles as small as 0.3 microns - expelling cleaner air than the air you breathe.
Although this is a very high level of filtration, a HEPA filter goes further and captures 99.99% of microscopic particles and allergens as small as 0.1 microns.
You can find sealed, whole-machine HEPA filtration on the latest Dyson Gen5detect vacuum, as well as other selected Dyson cordless vacuums:
https://www.dyson.co.uk/vacuum-cleaners/cordless/v15/detect-total-clean
https://www.dyson.co.uk/vacuum-cleaners/cordless/v12/detect-absolute-plus-yellow-iron
Finally, you might like to see some of the research our teams of engineers and microbiologists put into studying and solving the challenges of capturing and retaining pet hair, allergens and dust mites around the home:
I hope this helps, but let us know if you have any other questions!