Like all other laboratory equipment, fume hoods should be properly maintained to ensure that it is performing its function of protecting us, users, from contact with chemical hazards. In fact there are maintenance steps that should be followed on a weekly, monthly, quarterly and even yearly basis. For instance, a fume hood must undergo re-certification every year so that we are assured that it still complies with safety standards.
Here is an infograph on maintaining a ducted fume hood:
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