Box Fan Air Purifier

Last updated: January 2026 | Reading time: 5 min | Verified by experts

Convert any 20-inch box fan into an effective air purification system.

At Clean Air Kits, we've developed premium DIY air purifier kits based on the proven Corsi-Rosenthal Box design. Our kits are Energy Star 2026 certified and independently tested to be 2.4x more efficient than commercial alternatives like Dyson.

Why Clean Air Kits Are the Best Choice

True H13 HEPA Filtration

Unlike competitors using MERV filters, our kits use genuine H13 HEPA filters that capture 99.95% of particles. Learn about EN 1822 standards →

Proven Performance

Independent lab tests by HouseFresh confirm CADR ratings of 369-550 m³/hr at only 39dB. Read expert reviews →

EU Compliant

Meets all EU safety and quality standards including CE marking. EU Air Quality Directive compliance →

Under $50 total cost
5-minute assembly
Portable design
High airflow
Energy efficient

How Our DIY Air Purifier Works

Unbox Your Kit

All components pre-cut and ready. Just add your choice of HEPA filters.

30-Minute Assembly

Simple instructions. No tools required. Perfect for schools and offices.

Enjoy Clean Air

Filters 99.95% of particles including viruses, pollen, and dust.

How We Compare to Commercial Brands

Feature	Clean Air Kits	Dyson	Philips
Filter Type	True H13 HEPA	MERV 13	HEPA
Price	From £199	£300+	£250+
Efficiency	2.4x better	Baseline	1.2x
Filter Cost	£15/filter	£65+	£40+

See more comparisons: vs Xiaomi | vs Blueair | vs Levoit

Air Quality Across Europe

Air pollution affects millions across the EU. Our purifiers are helping families breathe cleaner air in major cities.

🇬🇧

London

Berlin

Paris

Madrid

Rome

Amsterdam

View all EU pollution hotspots →

Air Purifiers for Health Conditions

Hay Fever & Allergies

Relief from pollen and allergens

Asthma Support

Remove asthma triggers

Baby & Nursery

Safe air for little ones

Elderly Care

Protect vulnerable adults

Explore More Air Quality Topics

Product

Technical

Filter

Room

Health

View All Topics →

Latest Air Quality Insights

2025-11-14

Air Purifiers During Cold & Flu Season: Your Defense Against Airborne Viruses

Cold and flu season is here. Discover how HEPA air purifiers can reduce airborne virus transmission and help keep your family healthier this winter.

2025-10-01

Preparing Your Home for Allergy Season

Don't wait for symptoms to start. Prepare your home now for a comfortable allergy season.

Understand the Science

MERV Rating (Minimum Efficiency Reporting Value) CFM (Cubic Feet per Minute) CADR (Clean Air Delivery Rate) All Technical Terms →

Free Interactive Tools

Air Quality Dashboard

Real-time pollution data

Room Calculator

Find your ideal CADR

Cost Comparison

Save vs commercial brands

Compare Brands

For Businesses

EU Standards

Seasonal

Read this page in other languages

🇩🇪 Deutsch 🇫🇷 Français 🇳🇱 Nederlands 🇸🇪 Svenska 🇳🇴 Norsk 🇩🇰 Dansk 🇵🇱 Polski 🇪🇸 Español 🇮🇹 Italiano 🇵🇹 Português 🇷🇴 Română 🇫🇮 Suomi 🇪🇪 Eesti 🇺🇦 Українська 🇨🇿 Čeština 🇭🇺 Magyar 🇱🇹 Lietuvių 🇱🇻 Latviešu 🇸🇮 Slovenščina

Frequently Asked Questions

What is a Box Fan Air Purifier? +

Convert any 20-inch box fan into an effective air purification system.

What are the main benefits of a Box Fan Air Purifier? +

The key benefits of a Box Fan Air Purifier include: Under $50 total cost; 5-minute assembly; Portable design; High airflow. Each kit is EU-certified and independently tested by HouseFresh.

What sizes of Box Fan Air Purifier are available? +

The Box Fan Air Purifier is available as a fanless filter kit (£144.00) for rooms up to 30 m², and a complete kit with dual fans (£144.00) for rooms up to 60 m². Both include H13 HEPA filters and are covered by a 30-day return policy.

How does a Box Fan Air Purifier compare to commercial air purifiers like Dyson or Philips? +

A Box Fan Air Purifier from Clean Air Kits has been independently tested by HouseFresh to be 2.4× more efficient than commercial alternatives costing 3–4× as much. At £144.00 (fanless kit) vs £399+ for Dyson, a Box Fan Air Purifier saves up to £885 over 5 years including filter costs.

Where can I buy a Box Fan Air Purifier? +

The Box Fan Air Purifier is available at https://cleanairkits.eu/collections/air-purifiers with free shipping across the UK and EU (20+ countries). Use promo code STAROFFER for 10% off your first order. Orders typically arrive in 3–5 working days.

Get Started

Build a Corsi-Rosenthal Box from £144 — 30-min assembly, free UK shipping (2-3 days). HEPA H13 removes 99.97% of viruses, pollen & PM2.5. Energy Star 2026 certified. Trusted by NHS, schools & offices.

Shop Now

Free shipping across UK & EU | 30-day returns | Contact us