Blueair Blue Pure 511 Air Purifier review
A small bedroom or home office on the tightest budget
By Tom Calder · Price last checked 20 Sep 2026, 12:29 BST · price-tracked
The cheapest purifier on this list at £99, and its 38 m² coverage suits a single small-to-medium room rather than anything bigger. Blueair replaced the older 411/411+ with this 511 model in the UK, so treat it as the current comparable rather than a downgrade.
as of 20 Sep 2026, 12:29 BST · Details
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- Lowest price on this list at £99
- HEPASilent filter combines particle and carbon filtration in one stage
- Compact enough for a small bedroom or office
- Smallest stated room coverage on this list at 38 m², so it won't suit an open-plan space
- Blueair's own noise figures aren't fully consistent across their own materials, so treat the dB rating as approximate
- CADR is a converted figure rather than a figure Blueair publishes directly in m³/h
Who shouldn't buy this
you need to cover a room larger than about 38 m² — the Philips 2000i or Winix Zero are built for bigger spaces.
Key specs
| Room size | 38 m² |
| CADR | ~208 m³/h (converted from cfm, not Blueair-published) |
| Filter | HEPASilent combination particle and activated carbon filter |
| Noise (min) | 21 dB |
Our rating is a considered spec-and-evidence verdict: we verify every specification against at least two independent sources, re-check the UK price on a schedule where we can track it automatically, and say plainly who a product isn't for. Commissions never change a rating. Read the full methodology →
Alternatives to consider
as of 20 Sep 2026, 12:29 BST · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.as of 20 Sep 2026, 12:29 BST · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.Want this cheaper?
Prices for 364 tracked products are refreshed daily — last sweep 20 September 2026. Leave your email and we'll tell you when it drops — nothing else.