There are two good ways to get Corsi-Rosenthal clean air: build one for around £60, or buy an engineered kit that uses the same principle but runs quiet and tidy. Here's both.
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 CORSI10 for 10% off at checkout.Build your own (~£60)
A box fan plus four or five MERV-13 filters and tape. Cheapest, satisfying, and genuinely high-performing. Start with the build instructions — they list every part and where to buy it in the UK — and the best fans for a CR box.
Buy a ready-made Corsi-Rosenthal kit
If you'd rather not tape cardboard together, a ready-made kit uses the same MERV-13, multi-fan principle in a tidy, quiet enclosure. There is no single "official" Corsi-Rosenthal kit, and you won't find a genuine one on Amazon UK — the closest engineered equivalent is the CleanAirKits Luggable range: lab-measured CADR, standard MERV-13 filters (no proprietary lock-in), under 35 dB, and about £2 a year to run.
What's in a Corsi-Rosenthal box kit?
- DIY parts kit (~£60) — a 20-inch box fan, four or five MERV-13 filters, a cardboard shroud and tape. You assemble it in about 15 minutes.
- Engineered kit — a pre-built multi-fan unit with matched high-static-pressure fans and MERV-13 filters, ready to run out of the box, with a warranty and returns.
DIY kit vs ready-made — the numbers
| DIY CR box | 5-Fan Luggable | 7-Fan Luggable XL | |
|---|---|---|---|
| Typical cost | ~£60 | mid-range | flagship |
| Clean-air rate (CADR) | ~300–500 m³/h | ~490 m³/h | 681 m³/h |
| Filter | MERV-13 (standard) | MERV-13 (standard) | MERV-13 (standard) |
| Noise | 50–60 dB (box fan) | under 35 dB | under 35 dB |
| Running cost | ~£2/yr | ~£2/yr | ~£2/yr |
| Assembly | you build it | ready to run | ready to run |
| Best for | budget, tinkerers | bedrooms, offices | living rooms, open-plan |
Whichever route you pick, the science is identical — high airflow through MERV-13 media, giving you 5+ air changes an hour in a typical UK room. The DIY box wins on price; the engineered kit wins on noise, looks and a warranty.