Public Health England explain that “a single air change is estimated to remove 63% of airborne contaminants"

"After 5 air changes, less than 1% of the original airborne contamination is thought to remain” > Read the ventilation guidance

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Guidance for Large Airflow Ventilation

In confined spaces such as tunnels, pits, shafts and basements, maintaining a constant flow of fresh air can be challenging.

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