Xiaomi Smart Air Purifier 4 review
Buyers who want the highest published CADR for their money and are comfortable double-checking price and stock themselves
By Tom Calder · Updated 24 July 2026 · Price checked against our tracker
On paper this has the highest CADR on the whole list at 400 m³/h for a mid-range price, but it's also the least solidly sourced entry here — no confirmed UK ASIN and only an approximate price. Worth chasing down the exact BHR5101EN listing and a live price before treating this as a firm recommendation.
Approximate, lower-confidence UK price as of Jul 2026 — a live price for the standard model (SKU BHR5101EN) couldn't be independently confirmed this round, so treat this as indicative and check the live price before buying.
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- Highest published CADR on this list at 400 m³/h
- 99.97% particle removal at 0.3 microns, matching the True HEPA standard other brands use
- Compact 28–48 m² coverage suits most UK living rooms and bedrooms
- No confirmed UK Amazon listing — search using the exact SKU (BHR5101EN) rather than the generic product name to avoid mismatched or grey-import listings
- Price is an approximation and needs a live check before you commit
- At up to 64 dB on maximum, it's the loudest model on this list at full speed
Key specs
| Room size | 48 m² |
| CADR | 400 m³/h |
| Filter | 3-in-1 filtration, removes 99.97% of 0.3-micron particles |
| Noise (min) | — |
Our rating is a considered spec-and-evidence verdict: we verify every specification against at least two independent sources, track the UK price daily, and say plainly who a product isn't for. Commissions never change a rating. Read the full methodology →
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