For good quality assurance, laminar airflow hoods must be turned on before being used for how long?

5 minutes
10 minutes
20 minutes
30 minutes

30 minutes

Rationale: Laminar airflow hoods must be turned on for 30 minutes prior to each use. This is so that the HEPA filter has sufficient time to remove particulates from the air inside the hood and exhaust purified air across the work surface.

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