Class II (laminar flow) biological safety cabinet.

Area of Science:

• Microbiology
• Laboratory Safety Engineering

Background:

• Class II (laminar flow) safety cabinets are critical for laboratory containment.
• Previous assessments of their effectiveness in the UK are limited.
• Ensuring adequate biological containment is paramount for preventing aerosolized pathogen exposure.

Purpose of the Study:

• To survey the microbiological effectiveness of Class II safety cabinets used in the UK.
• To evaluate their aerosol containment capabilities compared to Class I cabinets.
• To inform purchasing and maintenance practices for safety cabinets.

Main Methods:

• A microbiological survey was conducted on nine Class II safety cabinets.
• Aerosol containment was assessed for each unit.
• Performance was benchmarked against Class I (exhaust protective) cabinets.

Main Results:

• Only two of the nine tested Class II cabinets demonstrated adequate aerosol containment.
• The majority of cabinets posed potential hazards when used with pathogenic materials.
• Performance varied significantly among the surveyed units.

Conclusions:

• Many Class II safety cabinets currently in use in the UK do not provide sufficient protection.
• New specifications from the National Sanitation Foundation and British Standards Institute are expected to improve cabinet performance.
• Careful cabinet selection, regular monitoring, and post-servicing checks are essential for maintaining safety.