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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
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
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
What Independent Experts Say
Unbiased reviews from HouseFresh — trusted air purifier testers with lab-grade equipment
Key Findings from Lab Testing
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2.4x More Efficient than any commercial competitor
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Whisper-Quiet at 39dB
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Cheapest Filters (£15/filter replacement)
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Energy Star 2025 Certified
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."
✓ 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!"
✓ 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!"
✓ 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!"
✓ 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!"
✓ Verified Purchase
"Snabb leverans till Sverige! Enkel att montera. Jag märkte skillnad redan efter första dagen - mindre damm, bättre luft. Mycket billigare än Blueair!"
Explore Air Purification Topics
DIY Air Purifier Kit UK
Create a powerful, cost-effective air purifier at home. Popular across UK homes - save 60-70% vs. commercial brands....
Learn More →Corsi-Rosenthal Box Kit UK - Premium CR Box from £144 | Free Shipping
Looking for a Corsi-Rosenthal Box? Clean Air Kits offers premium CR Box variants - professionally engineered kits inspir...
Learn More →CR Box Kit UK - Premium Kits from £144 | Free UK Shipping
Looking for a CR Box? Clean Air Kits offers premium CR Box variants - professionally designed kits that deliver superior...
Learn More →Box Fan Air Purifier
Convert any 20-inch box fan into an effective air purification system....
Learn More →HEPA Filter DIY UK
HEPA filters capture 99.97% of particles down to 0.3 microns. DIY solutions popular across UK provide same performance a...
Learn More →MERV 13 Filter
MERV 13 rated filters provide excellent particle capture for residential air purification....
Learn More →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...
Learn More →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 ...
Learn More →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 ...
Learn More →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."
Read More →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."
Read More →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."
Read More →Latest Air Quality Insights
Expert guides and seasonal tips for cleaner indoor air
Preparing Your Home for Allergy Season
Don't wait for symptoms to start. Prepare your home now for a comfortable allergy season.
Read Article →Complete Filter Maintenance and Replacement Guide
Maximize your air purifier's performance and lifespan with proper filter maintenance and replacement timing.
Read Article →Get in Touch
Have questions about our DIY air purifier kits? We're here to help!
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.