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Dyson Purifier Big+Quiet Formaldehyde BP04 vs Coway Airmega 400

Which Air Purifier Is Better?

    Top
    Main Differences
    Design
      BodyDisplay And ControlFilter Configuration
    Performance
      Particle Filtration RateLow-Noise Particle Filtration RateNoise
    Comments

Products

Dyson Purifier Big+Quiet Formaldehyde BP04
Coway Airmega 400 
early access

Tested using Methodology v1.2

Updated Jun 08, 2026 03:30 PM

SEE PRICE
BestBuy.com

Tested using Methodology v1.2

Updated Jun 10, 2026 05:59 PM

This review is in Early access

Unavailable
Missing store
Dyson Purifier Big+Quiet Formaldehyde BP04 Picture

Track

Coway Airmega 400 Picture

Track

Activated Carbon
Sheet
Activated Carbon
Pellets

Our Verdict

Dyson Purifier Big+Quiet Formaldehyde BP04

Coway Airmega 400

Full comparison details regarding individual product score sets can be found in the section below

GIFT THIS COMPARISON

0 

Variants

  • Purifier Big+Quiet Formaldehyde BP03 (Bright Nickel/Prussian Blue)
  • Purifier Big+Quiet Formaldehyde BP04 (Prussian Blue/Gold)

Review

See Dyson Purifier Big+Quiet Formaldehyde BP04 Review
See Coway Airmega 400 Review
4 
0 

Check Price

Bright Nickel/Prussian Blue
Purifier Big+Quiet Formaldehyde BP03
SEE PRICE
BestBuy.com
 
Prussian Blue/Gold
Purifier Big+Quiet Formaldehyde BP04
SEARCH
Amazon
 

Main Differences for
Pets

Threshold 

0.10

Pets 
 

7.8
0.0
No major differences between these air purifiers for pets. See full list of tests below.

Full Comparison

Design

Body  

Air Purifier Design Photo  

Compare High-Res
Dyson Purifier Big+Quiet Formaldehyde BP04 Air Purifier Design Photo
Coway Airmega 400 Air Purifier Design Photo Sample

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Height  

32.7" (83.0 cm)
Lock" (Lock cm)

Width  

16.3" (41.5 cm)
Lock" (Lock cm)

Depth  

17.1" (43.5 cm)
Lock" (Lock cm)

Weight 
 

25.1 lbs (11.4 kg)
Lock lbs (Lock kg)

Power Cord Length  

72.8" (185.0 cm)
Lock" (Lock cm)

Wheels 
 

Yes
Locked

Display And Control 
 

Main Controls  

Compare High-Res
Dyson Purifier Big+Quiet Formaldehyde BP04 Main Controls
Coway Airmega 400 Main Controls Sample

SAMPLE

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Alternative Controls  

Compare High-Res
Dyson Purifier Big+Quiet Formaldehyde BP04 Alternative Controls
Coway Airmega 400 Alternative Controls Sample

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Filter Change Indicator 
 

Yes
Locked

Air Quality Sensor Auto Mode 
 

Yes
Locked

Remote Control 
 

Yes
Locked

App 
 

Yes
Locked

Display On/Off 
 

Dimmable only
Locked

Timer Function 
 

Yes
Locked

Number Of Fan Speeds 
 

10
Lock

Filter Configuration  

Filter Configuration Photo  

Compare High-Res
Dyson Purifier Big+Quiet Formaldehyde BP04 Filter Configuration Photo
Coway Airmega 400 Filter Configuration Photo Sample

SAMPLE

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Filter Localization Photo  

Compare High-Res
Dyson Purifier Big+Quiet Formaldehyde BP04 Filter Localization Photo
Coway Airmega 400 Filter Localization Photo Sample

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Filtration Layers 
 

3 Stage
Locked

Activated Carbon 
 

Sheet
Locked
Performance

Particle Filtration Rate 
 

7.5
N/A

Purification Graph  

 Preview Graph
Dyson Purifier Big+Quiet Formaldehyde BP04 Purification Graph
Coway Airmega 400 Purification Graph Sample

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Measured PM1.0 CADR 
 

329 m³/hr (193 CFM)
Lock m³/hr (Lock CFM)

Recommended Room Size @ Max Fan Speed 
 

28.1 m² (302 ft²)
Lock m² (Lock ft²)

Low-Noise Particle Filtration Rate 
 

8.3
N/A

Purification Graph @ ≤ 45dBA  

 Preview Graph
Dyson Purifier Big+Quiet Formaldehyde BP04 Purification Graph @ ≤ 45dBA
Coway Airmega 400 Purification Graph @ ≤ 45dBA Sample

SAMPLE

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for pictures & test results

Measured PM1.0 CADR 
 

329 m³/hr (193 CFM)
Lock m³/hr (Lock CFM)

Fan Speed Used 
 

Speed 10
Locked

Recommended Room Size 
 

28.1 m² (302 ft²)
Lock m² (Lock ft²)

Noise 
 

8.8
N/A

Noise Video  

Coway Airmega 400 Noise Video Sample

SAMPLE

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for videos & test results

Noise @ Lowest Fan Speed 
 

33.4dBA
LockdBA

Noise @ Highest Fan Speed 
 

47.6dBA
LockdBA

Check Price

Bright Nickel/Prussian Blue
Purifier Big+Quiet Formaldehyde BP03
SEE PRICE
BestBuy.com
 
Prussian Blue/Gold
Purifier Big+Quiet Formaldehyde BP04
SEARCH
Amazon
 
Back to Top

Dyson Purifier Big+Quiet Formaldehyde BP04

Coway Airmega 400

Comments

  1. Comparison
 • Posted 3 hours ago

Dyson Purifier Big+Quiet Formaldehyde BP04 vs Coway Airmega 400: Main Discussion

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