When must the frequency of hood inspections be increased?

Increasing the frequency of hood inspections is essential in environments where potentially corrosive or obstructive conditions exist. This is because these conditions can lead to the deterioration or malfunction of hoods, which are critical for ensuring safe ventilation in laboratories using flammable gases. Corrosive materials can damage the internal components of the hood, while obstructive conditions can impede airflow and reduce the efficacy of the ventilation system. By conducting more frequent inspections, potential issues can be identified and addressed promptly, helping to maintain a safe working environment.

In contrast, non-corrosive conditions may not pose the same level of risk, and therefore, standard inspection frequencies may suffice. Annual reviews alone may not provide sufficient oversight to detect issues in more dynamic laboratory environments. Additionally, in laboratories without exhaust systems, the situation regarding inspections would be fundamentally different, as the absence of ventilation would create a greater risk factor, rather than an inspection frequency issue. Thus, the heightened inspection protocols in potentially corrosive or obstructive areas are crucial for continued safety.