ACH Air Changes Per Hour
ACH measures how many times room air is completely filtered per hour.
- Room sizing
- Health guidelines
- Effectiveness metric
- CDC recommendations
- Optimal performance
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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.