What HEPA means on a cordless vacuum

HEPA grades in plain terms

HEPA stands for high efficiency particulate air. In the UK and Europe, filter classes are set out in the standard EN 1822, which grades filter media by how efficiently it captures particles of the size that passes through it most easily, known as the most penetrating particle size. That size is typically a fraction of a micron, which is why you see figures like 0.1 or 0.3 microns on listings.

The two grades you will see most often on vacuums are H13 and H14. Under EN 1822, H13 media must capture at least 99.95 per cent of test particles at the most penetrating size, and H14 at least 99.995 per cent. Lower classes exist, often called EPA, and some makers use HEPA loosely without naming a grade. Where a listing names a grade, it tells you more than one that just says HEPA.

Makers also quote their own figures, often for the whole machine rather than the filter alone. Dreame lists the Z30 Ultra with an HEPA H14 filter rated 99.99 per cent at 0.1 microns. Dyson lists the V8 Origin with whole-machine filtration capturing 99.99 per cent of particles down to 0.3 microns. These are the makers' stated figures under their own test conditions, so they are not directly comparable with each other or with the EN 1822 grade thresholds.

Why sealing matters as much as the filter

A vacuum is a stream of air passing through a bin, a cyclone, one or more filters, the motor and out through vents. If there are gaps at joints, around the bin seal or where the filter sits, some air leaves without passing through the filter at all. A high-grade filter cannot capture particles that never reach it.

That is why makers talk about sealing. Dyson describes the V8 Advanced as having a fully sealed filtration system, and lists whole-machine filtration for the V8 Origin and V10 Animal. Shark's PowerPro listing includes a feature Shark calls Complete Seal, alongside a HEPA type filter. When comparing models, look for a sealing claim as well as a filter grade. The diagram below shows where pre-motor and post-motor filters typically sit, and the care and fixes section covers filter maintenance.

Washable vs replaceable filters

Many cordless vacuums use washable filters. Dyson lists washable filters on the V8 and V15 Detect Animal, and the V8 Origin listing advises rinsing monthly. Washable filters save on replacements, but they must be completely dry before refitting. A damp filter restricts airflow and can encourage odours. Most makers advise drying for at least 24 hours at room temperature, away from direct heat. Check your manual for the exact advice.

Some HEPA filters, especially on dock-based and bagged systems, are designed to be replaced rather than washed. Washing a non-washable filter can damage the media. Over time, any filter can wear or clog, so even washable ones may need replacing eventually. Use genuine parts or ones the maker approves for your model, as a poorly fitting filter undermines the seal.

1. 1

   Check the manual to confirm whether each filter is washable.

2. 2

   Remove the filter with the vacuum switched off and the battery removed if possible.

3. 3

   Tap loose dust into a bin, then rinse in cold water only, without detergent, unless the maker says otherwise.

4. 4

   Shake out excess water and leave to dry fully, typically at least 24 hours.

5. 5

   Refit only when completely dry, making sure it seats correctly.

Note:Switch the vacuum off and remove the battery where possible before removing filters. Never dry filters on a radiator, in a tumble dryer or in a microwave, and do not run the vacuum without its filters fitted.

Dyson V15 and Gen5 HEPA filters

The Dyson V15 Detect Animal listing gives its filter type as HEPA and notes a washable filter. The V11 and V12 Detect Slim listings also mention HEPA. Dyson's Gen5 models are widely described by Dyson as having fully sealed HEPA filtration, but grades and test figures can differ by model and market, so check Dyson's current specification for the exact claim on the version you are considering.

Older Dyson models use whole-machine filtration language rather than naming HEPA. That does not mean they lack fine filtration, only that the listing describes it differently. For more on cleaning Dyson filters, see how to clean Dyson filters.

Buying a vacuum with or without HEPA

A vacuum without a HEPA filter still has filters. Most use a cyclone to spin out larger dust, then a pre-motor filter and often a post-motor filter. For many homes that is enough for everyday cleaning. A HEPA specification tells you the maker has paid particular attention to fine particle capture at the exhaust.

If you want HEPA, look for a named grade, a stated capture figure, a sealing claim and clear instructions on filter care. Our best cordless vacuums with HEPA filters guide lists models whose listings state a HEPA type filter.

See cordless vacuums with HEPA filters →

Frequently asked questions

What is the difference between H13 and H14? Both are HEPA grades under EN 1822. H14 media must capture a higher share of test particles at the most penetrating particle size than H13. The grade describes the filter media, so sealing in the machine still matters.

Does the Dyson V15 have a HEPA filter? The V15 Detect Animal listing gives its filter type as HEPA and lists a washable filter. Check Dyson's current specification for the exact grade and figures for your version.

Can I wash a HEPA filter? Only if the maker says it is washable. Many vacuum HEPA filters are, and need rinsing in cold water and drying fully. Some are replace-only. Washing a non-washable filter can damage it.

Is a vacuum without HEPA worse? Not necessarily for everyday cleaning. It may simply not claim a named grade of fine particle capture. If filtration specification matters to you, choose a model that states a HEPA grade and sealed construction.