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Products in this category are scored under Frontum Air Purifiers Methodology v1.0: technical specifications plus authentic consumer ratings, with 0% commercial bias.
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PuroAir 400 Review | 45 Data compared

Avg. price:~£340Max. CADR:486 m³/hMaximum room area:185.8 m²Maximum noise level:60 dBHEPA filter:yesWeight:6.68 kg

PuroAir 400 Review: Compare 45 technical specifications and user reviews to see how this product ranks in the Air Purifiers category and whether it is worth buying.

PuroAir 400
8.2/10

Overall score

Score
8.2/ 10
✕
What it is
An overall evaluation of products in the Air Purifiers category, based on technical analysis and user reviews.
When it matters
When you need a quick reference for identifying the best products in the Air Purifiers category.
Score distribution
â–¼
<55-66-77-88-99-10
★ Better than 95% of models
Score components

80%

8.0

Technical score

20%

9.3

User score

★Better than 95% of air purifiers
8.0

Value for money

Value for money
8.0/ 10
✕
What it is
An indicator that combines the overall score of products in the Air Purifiers category with their prices.
When it matters
When you are comparing products in the Air Purifiers category and want a good balance between quality and price.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 77% of models
Score components

70%

8.2

Overall score

30%

7.6

Price

â–²Better than 77%
8.0

Technical score

Technical score
8.0/ 10
✕
What it is
An assessment of technical performance for products in the Air Purifiers category across these key areas: Performance, Features, Design.
When it matters
When you want to compare products in the Air Purifiers category by technical performance, specifications, and available features.
Score distribution
â–¼
<55-66-77-88-99-10
★ Better than 91% of models
Score components

50%

8.3

Performance

40%

8.1

Features

10%

5.7

Design

★Better than 91%
9.3

User score

User score
9.3/ 10
✕
What it is
A rating that combines user reviews with the total review volume for products in the Air Purifiers category.
When it matters
When you want to know how products in the Air Purifiers category perform in everyday use and how reliable owners find them over time.
Score distribution
â–¼
<55-66-77-88-99-10
★ Better than 93% of models
Score components

70%

9.0

User ratings

30%

10

Number of reviews

Based on ratings from across the web.
★Better than 93%
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Best prices
*As an Amazon Associate, we earn from qualifying purchases.
Best rankings
Available: ranking among products currently available (including other versions of this product).All: ranking among all products in the database.
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Technical Specifications of air purifier PuroAir 400

Technical score
Technical score
8.0/ 10
✕
What it is
An assessment of technical performance for products in the Air Purifiers category across these key areas: Performance, Features, Design.
When it matters
When you want to compare products in the Air Purifiers category by technical performance, specifications, and available features.
Score distribution
â–¼
<55-66-77-88-99-10
★ Better than 91% of models
Score components:

50%

8.3

Performance

40%

8.1

Features

10%

5.7

Design

8.0
User score
User score
9.3/ 10
✕
What it is
A rating that combines user reviews with the total review volume for products in the Air Purifiers category.
When it matters
When you want to know how products in the Air Purifiers category perform in everyday use and how reliable owners find them over time.
Score distribution
â–¼
<55-66-77-88-99-10
★ Better than 93% of models
Score components

70%

9.0

User ratings

30%

10

Number of reviews

Based on ratings from across the web.
9.3
Popularity
Popularity
10/ 10
✕
What it is
An indicator based on the number of reviews received by products in the Air Purifiers category.
When it matters
When you prefer products in the Air Purifiers category that have been chosen and reviewed by many other buyers.
Score distribution
â–¼
<55-66-77-88-99-10
★ Better than 92% of models
Popularity:
PuroAir 400 has a popularity score of 10 points, which is higher than 92.4% of products in this category.
10
Value for money
Value for money
8.0/ 10
✕
What it is
An indicator that combines the overall score of products in the Air Purifiers category with their prices.
When it matters
When you are comparing products in the Air Purifiers category and want a good balance between quality and price.
Score distribution
â–¼
<55-66-77-88-99-10
â–² Better than 77% of models
Score components:

70%

8.2

Overall score

30%

7.6

Price

8.0
Power
80 W
Market range: <10 W – >68 W
This air purifier has a power output of 80 W, which is higher than that of 93.9% of air purifiers and the same as that of 1.1% of air purifiers.
Max. CADR
486 m³/h
Market range: <100 m³/h – >515 m³/h
This air purifier delivers a CADR of 486 m³/h, which is higher than that of 86.3% of air purifiers.
Maximum room area
185.8 m²
Market range: <20 m² – >130 m²
This air purifier covers up to 185.8 m², which is larger than 98.3% of air purifiers.
N. of speeds
3
Market range: <3 – >5
This air purifier offers 3 fan speeds, which is more than 6.7% of air purifiers and the same as 48.6% of air purifiers.
Maximum noise level
60 dB
Market range: <32 dB – >61 dB
This air purifier reaches 60 dB at maximum speed, which is louder than 78.7% of air purifiers and the same as 4.3% of air purifiers.
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Air quality indicator
yes
This air purifier has an air-quality indicator. This feature is present on 65.4% of air purifiers.
Continuous purification
yes
This air purifier supports continuous purification. This feature is present on 86.3% of air purifiers.
Auto mode
yes
This air purifier has auto mode. This feature is present on 67% of air purifiers.
Timer
yes
This air purifier has a timer. This feature is present on 75% of air purifiers.
Maximum timer
8 hours
Market range: <8 hours – >24 hours
This air purifier features a maximum timer of 8 hours, which is longer than that of 5.5% of air purifiers and the same as that of 57.8% of air purifiers.
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Color
black
Material
plastic
Display
no
This air purifier does not have a display. This feature is present on 51.1% of air purifiers.
Display position
N/A
Control type
touch
Show more

PuroAir 400 vs the average air purifier

246810TotalPerformanceFeaturesDesign
  • 136.8 m² larger room area
    This air purifier covers a larger room area than the average air purifier (185.8 m² vs 49 m²).
    185.8 m² vs 49 m²
  • 2.03x higher CADR
    This air purifier provides a higher clean air delivery rate than the average air purifier (486 m³/h vs 240 m³/h).
    486 m³/h vs 240 m³/h
  • 42.5 W higher power
    This air purifier has a higher power output than the average air purifier (80 W vs 37.5 W).
    80 W vs 37.5 W
  • Has a child lock
    This air purifier has a child lock; the average air purifier does not.
  • Supports 360° purification
    This air purifier supports 360° purification; the average air purifier does not.
  • Has a handle
    This air purifier has a handle; the average air purifier does not.
  • 15.5% higher user score
    User score
    9.3/ 10
    ✕
    What it is
    A rating that combines user reviews with the total review volume for products in the Air Purifiers category.
    When it matters
    When you want to know how products in the Air Purifiers category perform in everyday use and how reliable owners find them over time.
    Score distribution
    â–¼
    â–¼
    <55-66-77-88-99-10
    PuroAir 400
    the average air purifier
    PuroAir 400 has a higher user score than the average air purifier (9.30 vs 8.048).
    9.3 vs 8.05
  • 50% more popular
    PuroAir 400 is more popular than the average air purifier (10 vs 6.7).
    10 vs 6.67
  • 15.5% higher user score
    User score
    9.3/ 10
    ✕
    What it is
    A rating that combines user reviews with the total review volume for products in the Air Purifiers category.
    When it matters
    When you want to know how products in the Air Purifiers category perform in everyday use and how reliable owners find them over time.
    Score distribution
    â–¼
    â–¼
    <55-66-77-88-99-10
    PuroAir 400
    the average air purifier
    PuroAir 400 has a higher user score than the average air purifier (9.30 vs 8.048).
    9.3 vs 8.05
  • 50% more popular
    PuroAir 400 is more popular than the average air purifier (10 vs 6.7).
    10 vs 6.67
  • 6.9% better value for money
    PuroAir 400 offers better value for money than the average air purifier (8.03 vs 7.5).
    8.03 vs 7.52
  • 136.8 m² larger room area
    This air purifier covers a larger room area than the average air purifier (185.8 m² vs 49 m²).
    185.8 m² vs 49 m²
  • 2.03x higher CADR
    This air purifier provides a higher clean air delivery rate than the average air purifier (486 m³/h vs 240 m³/h).
    486 m³/h vs 240 m³/h
  • 42.5 W higher power
    This air purifier has a higher power output than the average air purifier (80 W vs 37.5 W).
    80 W vs 37.5 W
  • Supports 360° purification
    This air purifier supports 360° purification; the average air purifier does not.
  • Has a child lock
    This air purifier has a child lock; the average air purifier does not.
  • Has a handle
    This air purifier has a handle; the average air purifier does not.
  • 1.43 cm shallower depth
    This air purifier is shallower than the average air purifier (20.6 cm vs 22 cm).
    20.57 cm vs 22 cm
  • No washable prefilter
    This air purifier does not have a washable prefilter; the average air purifier does.
  • 7 dB higher maximum noise level
    This air purifier runs louder at maximum speed than the average air purifier (60 dB vs 53 dB).
    60 dB vs 53 dB
  • 0.07 % percentage points lower bacteria elimination
    This air purifier achieves lower certified bacteria elimination than the average air purifier (99.9 % vs 99.97 %).
    99.9 % vs 99.97 %
  • No display
    This air purifier does not have a display; the average air purifier does.
  • 46.2% higher weight
    This air purifier is heavier than the average air purifier (6.7 kg vs 4.57 kg).
    6.68 kg vs 4.57 kg
  • 9.28 cm wider width
    This air purifier is wider than the average air purifier (36.6 cm vs 27.3 cm).
    36.58 cm vs 27.3 cm
  • 2.43x more expensive
    PuroAir 400 is more expensive than the average air purifier (£340 vs £140).
    £340 vs £140
  • 4.61 cm taller height
    This air purifier is taller than the average air purifier (54.6 cm vs 50 cm).
    54.61 cm vs 50 cm
  • 2.43x more expensive
    PuroAir 400 is more expensive than the average air purifier (£340 vs £140).
    £340 vs £140
  • 7 dB higher maximum noise level
    This air purifier runs louder at maximum speed than the average air purifier (60 dB vs 53 dB).
    60 dB vs 53 dB
  • No washable prefilter
    This air purifier does not have a washable prefilter; the average air purifier does.
  • 0.07 % percentage points lower bacteria elimination
    This air purifier achieves lower certified bacteria elimination than the average air purifier (99.9 % vs 99.97 %).
    99.9 % vs 99.97 %
  • No display
    This air purifier does not have a display; the average air purifier does.
  • 46.2% higher weight
    This air purifier is heavier than the average air purifier (6.7 kg vs 4.57 kg).
    6.68 kg vs 4.57 kg
  • 9.28 cm wider width
    This air purifier is wider than the average air purifier (36.6 cm vs 27.3 cm).
    36.58 cm vs 27.3 cm
  • 4.61 cm taller height
    This air purifier is taller than the average air purifier (54.6 cm vs 50 cm).
    54.61 cm vs 50 cm
  • 33.8% larger external volume
    This air purifier has a larger overall volume than the average air purifier (41091.3 cm³ vs 30700.8 cm³).
    41,091.327266 cm³ vs 30,700.8 cm³

Video reviews

Hands-on testing, unboxing, and real-world video evaluations

Third-party reviews

Based on ratings from across the web.
Reviews last updated: August 2026 · How we calculate this

What we like about PuroAir 400

  • Covers large spaces effectively, purifying rooms up to 2,000 square feet.
  • Very quiet operation, especially when using the dedicated sleep mode.
  • Noticeably reduces household dust, pet dander, pollen, and seasonal allergy triggers.
  • Includes a helpful auto mode that uses a smart sensor to adjust fan speed based on live air quality.
  • Simple, intuitive control panel that makes it easy to set up and operate.
  • Efficiently eliminates odors and smoke using its activated carbon layer.

What we don't like about PuroAir 400

  • High long-term maintenance costs due to expensive replacement filters that require frequent swapping.
  • Consumes more electricity and energy compared to similar models in its performance class.
  • The physical placement of the air quality sensor and filter on the back can complicate wall placement.
  • The unit is somewhat bulky and heavy, making it less ideal for tight spaces.
  • Some users report that the control buttons can occasionally feel unresponsive.

Verdict

The PuroAir 400 is an 80-watt corded electric air purifier designed for spaces up to 2,145 square feet, capable of circulating and cleaning the air within an hour using a 3-layer filtration system that captures 99.99% of particulate matter down to 0.1 microns. Its core characteristics include a medical-grade HEPA 14 filter, a CarbonTech activated carbon layer to reduce odors and volatile organic compounds (VOCs), a smart particle sensor for automated fan speed adjustments, a child lock, and a programmable timer. Key advantages are its powerful large-room coverage, an integrated real-time air quality indicator light, and an ultra-quiet sleep mode that operates at just 31 decibels. However, notable drawbacks include high long-term maintenance costs due to recommended 90-day filter replacements, higher energy consumption at maximum speeds compared to some competitors, and a somewhat bulky, 14.7-pound physical frame.

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