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ACH

The Hong Kong Food and Health Bureau has stated that the current licensed dine-in establishments are required to provide a minimum of 17 cubic meters of outdoor air per person through their ventilation systems. This generally achieves a reconstruction ventilation rate of approximately 3.8 to 4.9 air changes per hour or above. However, due to several key risk factors in restaurant dining, such as prolonged mask removal and close-range conversations, a ventilation rate of 6 air changes per hour has been determined to mitigate the risks.

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