# Winix 5520 vs Dyson Purifier Big+Quiet Formaldehyde BP04: specs and price compared

A sourced, side-by-side comparison of the Winix 5520 (Winix) and Dyson Purifier Big+Quiet Formaldehyde BP04 (Dyson) among air purifiers. Winix 5520 is the cheaper of the two at $259.99.

## Side by side

| Spec | Winix 5520 | Dyson Purifier Big+Quiet Formaldehyde BP04 |
| --- | --- | --- |
| US price | $259.99 | $1199.99 |
| Brand | Winix | Dyson |
| Released | 2022 | 2023 |
| Cadr smoke (CFM) | 253 | — |
| Coverage (sq ft) | 392 | — |
| Hepa | Yes | Yes |
| Filter type | Fine Mesh Pre-filter + AOC Carbon + True HEPA + PlasmaWave (4-stage) | 360° HEPA H13 + K-Carbon filter + SCO (Selective Catalytic Oxidization) formaldehyde filter |
| Noise db min | 23.5 | — |
| Smart | Yes | Yes |
| Energy star | No | No |

## Key differences

- Filter type: Winix 5520 Fine Mesh Pre-filter + AOC Carbon + True HEPA + PlasmaWave (4-stage) vs Dyson Purifier Big+Quiet Formaldehyde BP04 360° HEPA H13 + K-Carbon filter + SCO (Selective Catalytic Oxidization) formaldehyde filter

## What reviewers say

**Winix 5520** — Only one whitelisted tester (Wirecutter) hands-on tested the exact Winix 5520, and only in its dismissed-competition section: a capable purifier that tested worse and louder than Coway's Mighty 2, with a dark, monolithic form that stands out in most rooms, a display that shuts off only on the lowest and least effective fan speed, and an ionizer that reactivates on every power-on. No lab numbers were published for this model. (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

- Winix 5520: https://www.winixamerica.com/product/5520/ (winixamerica.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/winix-5520-vs-dyson-purifier-big-quiet-bp04/
Cite: Per The Front Desk Review, Winix 5520 ($259.99) vs Dyson Purifier Big+Quiet Formaldehyde BP04 ($1199.99) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/air-purifiers/winix-5520-vs-dyson-purifier-big-quiet-bp04/
License: CC BY 4.0.