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Blueair Blue Pure 211i Max UK Review (2026): The Large-Room HEPASilent Pick

Updated: October 2026 · Large-room coverage · Prices checked 21 Oct 2026

Verdict: The Blueair Blue Pure 211i Max at £301.30 delivers 697 m³/h CADR — the highest of any single unit in our UK dataset — covering 97 m² at 3 ACH. HEPASilent technology is not True HEPA and not EN 1822 rated. At 23 dB sleep mode it is substantially quieter than the old 211+ Auto (31 dB). Filter costs are £69/yr on an annual replacement cycle — lower per-cycle than the old 211+ Auto. 3-year TCO: £656.38. The case for choosing it over two Levoit Core 400S units depends on whether you need single-unit simplicity over maximum CADR-per-£.

CADR and Room Coverage

The 211i Max reports CADR at 410 CFM (AHAM-equivalent, converted to 697 m³/h at ×1.699). This is the highest single-unit CADR in the PurifierBeast UK dataset. At 3 air changes per hour — the standard used in HEPA efficacy studies — the coverage calculation is:

Coverage at 3 ACH:

697 m³/h ÷ 3 ÷ 2.4 m ceiling = 97 m²

At 2 ACH (the minimum for basic air quality improvement): 145 m². At 1 ACH (the figure many manufacturers use): 290 m².

We use 3 ACH throughout this site because it is the standard in HEPA filtration studies and reflects meaningful air cleaning rather than single-pass coverage.

HEPASilent: The Important Caveat

Not True HEPA, not EN 1822 rated. The 211i Max uses HEPASilent — Blueair's proprietary electrostatic-plus-mechanical filtration. This is not True HEPA (≥99.97% at 0.3 µm) and has not been independently certified to EN 1822 H13 or H14. For most household allergen, dust, and pollen use cases, HEPASilent performs comparably to True HEPA in practice. If you require documented EN 1822 certification for clinical or compliance reasons, the 211i Max does not satisfy that requirement.

Blueair's electrostatic approach pre-charges particles before they reach the filter, allowing lower-density mechanical media that reduces airflow resistance — enabling the same volume of air at lower fan speed (and therefore lower noise). At 23 dB sleep mode, the 211i Max is 8 dB quieter than the 211+ Auto it replaces.

For the full EN 1822 explainer and comparison between HEPASilent and certified HEPA, see our HEPA filter grades guide.

UK Specs at a Glance

CADR

697 m³/h

410 CFM × 1.699 (manufacturer)

Room Coverage

97 m² at 3 ACH

Noise

23 dB sleep / 53 dB max

Power

46W (manufacturer-stated)

Filter

£69.00 / 12 months

HEPASilent — not True HEPA, not EN 1822 rated

Certifications

None

UK Price

£301.30

Checked 21 Oct 2026. Verify before purchasing.

Running Costs and 3-Year TCO

  • Electricity: £49.36/year (46W confirmed × 12h × 365 days at 24.5p/kWh)
  • Filter replacement: £69.00/year (£69.00 × 1 replacement per year at 12-month interval)
  • Annual running cost: £118.36/year
  • Filter as percentage of annual running cost: 58%
  • 3-year total (including unit at £301.30): £656.38

Single Unit vs Two Levoit Core 400S: The Honest Comparison

Option Combined CADR Covers (3 ACH) Sleep noise 3-yr total
1× Blueair 211i Max (this model) 697 m³/h 97 m² 23 dB £656.38
2× Levoit Core 400S 748 m³/h combined Up to 50 m²* ~27 dB combined £727.14

*Two units in the same room do not double effective coverage — placement matters. See the large room guide for the full analysis. 3-yr TCO at Ofgem 24.5p/kWh, 12 h/day.

The 211i Max is £70.76 cheaper over 3 years than two Core 400S units, while providing 97 m² single-unit coverage. The trade-off: no redundancy, one socket, less CADR for a two-zone open-plan space. For a single large room, the 211i Max is the cleaner solution at a lower 3-year cost.

Verdict: Who Should Buy the Blueair Blue Pure 211i Max

Buy the 211i Max if: you have a single large UK room (up to 30 m² at 3 ACH is a realistic target; 97 m² is the theoretical maximum), you want single-unit simplicity, and you understand that HEPASilent is not EN 1822 certified. At 23 dB sleep mode, it is considerably quieter than most large-room units.

Do not buy the 211i Max if: you need EN 1822 certified H13 HEPA filtration (choose the Philips 3200 AC3220 or the new Philips 2200 AC2220 instead), or if you have a genuinely large open-plan space that would benefit more from two strategically placed mid-size units.

For the full large-room analysis see the best air purifier for large rooms UK guide. For the Blueair range context see the Blueair UK brand page.

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