DIY Air Purifier - Energy Star 2025 Certified

Europe's Best DIY Air Purifier - UK & 12 EU Countries

Energy Star 2025 Certified - Serving UK, Germany, France, Netherlands, Sweden, Norway, Denmark, Poland, Spain, Italy, Portugal & Romania

Energy Star 2025 Europe's Leading DIY Air Purifier - Tested by Intertek - Energy Star 2025 Certified

🚚 We ship to all European countries (EU & non-EU)

Complete Air Purifier Kit - Everything You Need

DIY Air Purifier Kit Components - CADR 369-550 m³/hr with 5-7 Sickleflow 120 fans, pre-cut MDF panels, power supply, cable ties, screws, and fan grills

Professional-Grade Components

  • High-Performance Fans - 5-7 Sickleflow 120 fans delivering CADR 369-550 m³/hr
  • Precision-Cut Panels - Pre-cut MDF panels for perfect assembly
  • Complete Hardware - All screws, cable ties, and fan grills included
  • Power Supply Included - Energy-efficient and reliable
  • Easy Assembly - Build your purifier in under 30 minutes
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What Independent Experts Say

Unbiased reviews from HouseFresh — trusted air purifier testers with lab-grade equipment

"The World's Most EFFICIENT Air Purifier?"

HouseFresh — Danny Ashton (UK) 2025

"The QUIETEST Air Purifier I've Tested"

HouseFresh — Danny Ashton (UK) 2025

Key Findings from Lab Testing

2.4x More Efficient than any commercial competitor
Whisper-Quiet at 39dB
Cheapest Filters (£15/filter replacement)
Energy Star 2025 Certified
Shop the Luggable XL Ultra →

Why Europe Chooses Our DIY Air Purifiers

Pan-European Coverage

Available across 12 European countries with local pricing and support

Europe's Best Value

300-600 CFM CADR - Save 60-70% vs commercial European brands

Easy Assembly Anywhere in Europe

Build in under 30 minutes - Instructions in 12 European languages

Trusted Across Europe

Corsi-Rosenthal design validated by European health experts

🏙️ London Air Quality Special

Discover how DIY air purifiers can help combat London's air pollution. Learn about real PM2.5 data, respiratory health impacts, and why clean indoor air matters for Londoners.

What Our European Customers Say

Real experiences from customers across UK and Europe

✓ Verified Purchase
"Livraison rapide en 4 jours ! J'ai assemblé le purificateur en 25 minutes. Dès la première nuit, ma respiration était plus facile. Fini les allergies au pollen ! Excellent rapport qualité-prix."
Sophie Dupont Paris, France
✓ Verified Purchase
"Schnelle Lieferung nach Deutschland! Der Aufbau war kinderleicht. Nach 3 Tagen merkte ich einen deutlichen Unterschied - weniger Staub, besserer Schlaf. Viel günstiger als Dyson!"
Klaus Müller Berlin, Germany
✓ Verified Purchase
"Otrzymałam paczkę w 5 dni! Montaż zajął mi pół godziny. Już pierwszego dnia poczułam różnicę - powietrze jest czystsze, mniej kurzu. Idealny dla alergików!"
Anna Kowalska Warsaw, Poland
✓ Verified Purchase
"Hurtig levering til Danmark på kun 3 dage! Nem at samle. Min astma er meget bedre nu. Sover bedre om natten. Anbefaler stærkt!"
Lars Hansen Copenhagen, Denmark
✓ Verified Purchase
"Snelle verzending binnen 4 dagen! Binnen een half uur in elkaar gezet. Mijn hooikoorts is direct verminderd. De lucht voelt frisser. Geweldig product!"
Maria van den Berg Amsterdam, Netherlands
✓ Verified Purchase
"Snabb leverans till Sverige! Enkel att montera. Jag märkte skillnad redan efter första dagen - mindre damm, bättre luft. Mycket billigare än Blueair!"
Erik Andersson Stockholm, Sweden

Understanding Technical Terms

CADR (Clean Air Delivery Rate)

CADR (Clean Air Delivery Rate) is the industry-standard metric for measuring air purifier effectiveness. It indicates th...

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CFM (Cubic Feet per Minute)

CFM (Cubic Feet per Minute) measures the volume of air that flows through an air purifier or ventilation system. It's a ...

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MERV Rating (Minimum Efficiency Reporting Value)

MERV (Minimum Efficiency Reporting Value) is a rating system from 1-20 that measures air filter efficiency. Higher MERV ...

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What Experts Say

Danny Ashton

HouseFresh (UK)

"The Corsi-Rosenthal Box is not just a budget alternative - it's a genuinely high-performance air purifier that happens to be incredibly affordable. Our testing confirms what scientists have been saying: this DIY design works exceptionally well."

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Alex Kessler

Alex Kessler - Healthy Home Guide (USA)

"As an indoor air quality professional, I'm impressed by how effective these DIY solutions are. The Corsi-Rosenthal Box isn't just cost-effective - it's genuinely high-performing air purification that I recommend to my clients."

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Independent Tester

YouTube Comparison Test

"The results speak for themselves - these DIY air purifiers are not compromising on performance. If anything, they're overperforming relative to their cost."

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Latest Air Quality Insights

Expert guides and seasonal tips for cleaner indoor air

Get in Touch

Have questions about our DIY air purifier kits? We're here to help!

We respect your privacy. Your information will only be used to respond to your inquiry.

Typical response time: 24 hours

Frequently Asked Questions

What is a CR Box or Corsi-Rosenthal Box?

A CR Box (Corsi-Rosenthal Box) is a DIY air purifier design invented by professors Richard Corsi and Jim Rosenthal. Clean Air Kits offers premium CR Box variant kits with pre-cut panels and professional components that deliver superior performance - removing 99.95% of airborne particles including dust, pollen, and viruses.

How much do Clean Air Kits CR Box kits cost?

Our premium CR Box variant kits start at £144 for fanless kits (you supply your own fans) and £204 for complete kits with high-quality fans included. This is significantly cheaper than commercial air purifiers like Dyson (£300+) while providing superior HEPA H13 filtration.

What's included in your CR Box kits?

Our kits include pre-cut MDF panels, all mounting hardware, cable ties, and detailed instructions. Complete kits (£204+) also include 5-7 high-performance Sickleflow 120 fans and power supply. Everything you need - just add your choice of HEPA filters.

Why choose Clean Air Kits over building my own CR Box?

Our premium kits use precision-cut panels and professional components for superior build quality and performance. No cutting, measuring, or sourcing parts - just simple assembly in about 30 minutes. Our kits outperform traditional DIY builds with better airflow and filtration efficiency.

Do you offer free shipping to the UK?

Yes, we offer free shipping across the UK with delivery in 2-3 business days. We also ship to all EU countries including Germany, France, Netherlands, Sweden, and more with competitive shipping rates.

How often do I need to replace the filters?

HEPA filters typically last 6-12 months depending on usage and air quality. We recommend checking filters monthly and replacing when visibly dirty. Compatible replacement filters are widely available.

Get Started

CR Box UK: Build in 30 mins for under £199 (VAT included). Free UK shipping (2-3 days). True H13 HEPA 2.4x more efficient than Dyson MERV filters. Energy Star 2025 certified. Trusted by NHS, schools & offices.