Shopping for a purifier, you will run into two broad camps: high-airflow Corsi-Rosenthal/MERV-13 designs, and traditional HEPA units. This is a buyer's-eye comparison — for the filter-science deep dive, see the Corsi-Rosenthal resource.
681 m³/h CADR, MERV-13, under 35 dB — powerful whole-home clean air — no proprietary lock-in, ships from the UK.
Check price →Use code KITS10 for 10% off at checkout.The trade in one line
HEPA captures slightly more per pass but resists airflow; high-airflow MERV-13 moves far more air so it clears a room faster. For everyday home air — pollen, dust, smoke — the high-airflow approach usually gives better real-world clean-air delivery per pound.
What buyers actually care about
| CR / MERV-13 kit | Traditional HEPA | |
|---|---|---|
| Clean-air delivery | Very high | Moderate |
| Filter cost/yr | ~£40 standard | Often proprietary |
| Per-pass capture | ~93% | 99.97% |
| Noise at equal clean air | Lower | Higher |
Which should you buy?
For homes, allergies, smoke and general air quality: a high-airflow MERV-13 kit. Choose HEPA only if you have a specific need for maximum single-pass capture and don't mind proprietary filters. Prefer to build? The CR box build guide is the DIY route.