ACH Calculator | Free Air Changes Per Hour Calculator UK 2026

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Part of the UK's largest network of air quality resources, providing education, products, and solutions for cleaner indoor air.

Clean Air Kits →
Premium ready-to-assemble air purifier kits with all components included. Professional-grade HEPA filtration made accessible.
Corsi-Rosenthal Box →
The official guide to building Corsi-Rosenthal Box air purifiers. Learn the history, science, and step-by-step assembly instructions.
Clean Air Kits Blog →
In-depth how-to guides, air quality research, and practical tips for maintaining optimal indoor air quality.
Air Purifier Kits →
Comprehensive buyer guides comparing DIY and commercial air purifiers. Find the perfect air purification solution for your needs.
Clean Air Kits London →
London-focused air quality solutions. Local case studies, school implementations, and UK regulatory compliance guides.

Educational content only. Not a substitute for medical or professional advice.