# Blueair Blue Pure 211i Max vs Dyson Purifier Big+Quiet Formaldehyde BP04: specs and price compared

A sourced, side-by-side comparison of the Blueair Blue Pure 211i Max (Blueair) and Dyson Purifier Big+Quiet Formaldehyde BP04 (Dyson) among air purifiers. Blueair Blue Pure 211i Max is the cheaper of the two at $349.99.

## Side by side

| Spec | Blueair Blue Pure 211i Max | Dyson Purifier Big+Quiet Formaldehyde BP04 |
| --- | --- | --- |
| US price | $349.99 | $1199.99 |
| Brand | Blueair | Dyson |
| Released | 2022 | 2023 |
| Cadr smoke (CFM) | 443 | — |
| Coverage (sq ft) | 674 | — |
| Hepa | Yes | Yes |
| Filter type | HEPASilent dual filtration (mechanical + electrostatic) + Activated Carbon, 4-layer | 360° HEPA H13 + K-Carbon filter + SCO (Selective Catalytic Oxidization) formaldehyde filter |
| Noise db min | 23 | — |
| Smart | Yes | Yes |
| Energy star | Yes | No |

## Key differences

- Filter type: Blueair Blue Pure 211i Max HEPASilent dual filtration (mechanical + electrostatic) + Activated Carbon, 4-layer vs Dyson Purifier Big+Quiet Formaldehyde BP04 360° HEPA H13 + K-Carbon filter + SCO (Selective Catalytic Oxidization) formaldehyde filter
- Energy star: Blueair Blue Pure 211i Max Yes vs Dyson Purifier Big+Quiet Formaldehyde BP04 No

## What reviewers say

**Blueair Blue Pure 211i Max** — Only one whitelisted tester, Wirecutter, published hands-on measured results for this exact model, naming it their large-room upgrade pick. Wirecutter found it a stellar, quiet, energy-efficient large-room performer (>99.9% smoke reduction), with a durability caveat on the washable fabric cover. (1 sourced review.)

**Dyson Purifier Big+Quiet Formaldehyde BP04** — Three whitelisted outlets (TechRadar, Reviewed/USA Today, TechHive) hands-on or lab tested the Dyson Purifier Big+Quiet Formaldehyde; TechRadar and Reviewed covered the higher CO2-sensor trim (aligned with BP04) while TechHive tested the base Formaldehyde unit. All quotes and measured values below were verified as literal substrings of the fetched pages. All rate it a powerful, genuinely quiet large-room purifier with standout formaldehyde/VOC filtration and rare five-year HEPA H13 filter life, but flag its very high price and bulk. Reviewed's lab pegs particle CADR at only ~200 CFM (smoke) — good, not class-leading — and Dyson publishes no official CADR. (3 sourced reviews.)

## Sources

- Blueair Blue Pure 211i Max: https://www.blueair.com/products/blue-pure-211i-max (blueair.com, verified 2026-06-15)
- Dyson Purifier Big+Quiet Formaldehyde BP04: https://www.dyson.com/air-treatment/air-purifiers/big-quiet-formaldehyde/prussian-blue-gold-bp04 (dyson.com, verified 2026-06-15)

Canonical: https://frontdeskreview.com/gear/air-purifiers/blueair-blue-pure-211i-max-vs-dyson-purifier-big-quiet-bp04/
Cite: Per The Front Desk Review, Blueair Blue Pure 211i Max ($349.99) vs Dyson Purifier Big+Quiet Formaldehyde BP04 ($1199.99) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/air-purifiers/blueair-blue-pure-211i-max-vs-dyson-purifier-big-quiet-bp04/
License: CC BY 4.0.