HEPA vs MERV-13: Which Air Filter Is Right for a UK Home?

Shoppers are often told that HEPA is the only filter worth buying. The reality is more nuanced: HEPA and MERV-13 are two different standards optimised for two different jobs, and for an everyday UK home the headline capture number is not the metric that decides how clean your air actually gets.

HEPA captures slightly more per single pass — 99.97% versus roughly 93–99% for a good MERV-13 media. But HEPA media is dense, so it resists airflow: the fan has to work harder, which usually means more noise and less total air moved per hour. A high-airflow MERV-13 design moves far more air through a less restrictive filter, so it cycles the whole room through the filter more times an hour. Because clean-air delivery is capture rate multiplied by airflow, the unit that moves more air typically clears a room faster in real-world conditions.

MERV-13 also wins decisively on cost and standardisation: filters are an independently-rated commodity you can buy anywhere for £15–20, versus £50–100 for proprietary HEPA cartridges.

For the full technical breakdown — capture rates by particle size, airflow resistance, running cost and how to size a unit by CADR — see this independent HEPA vs MERV filters guide.

Want a ready-built high-airflow MERV-13 unit? See the Luggable range →