Bacteriological testing of a modified laminar flow microbiological safety cabinet

Area of Science:

• Microbiology
• Biosafety Engineering

Background:

• Microbiological safety cabinets are essential for protecting personnel and the environment from hazardous biological agents.
• Existing cabinets may have limitations in versatility and containment effectiveness.

Purpose of the Study:

• To evaluate the microbiological safety performance of a modified cabinet adaptable for both Class II and Class III use.
• To assess containment efficacy under simulated operational conditions.

Main Methods:

• Bacteriological testing using artificial aerosols and human subjects (dummy/test person).
• Evaluation of inward and outward contamination transfer with arms inserted into the cabinet opening.
• Assessment of environmental leakage when configured as a Class III cabinet with a glove panel.

Main Results:

• Minimal outward transfer of test aerosols from the cabinet to the environment was detected, even at high concentrations.
• Outward bacterial transfer was deemed acceptable due to low detection levels.
• Environmental leakage into the cabinet occurred in Class III configuration but was eliminated by taping the front panel hinge.

Conclusions:

• The modified cabinet demonstrates safe performance as both a Class II and Class III microbiological safety cabinet.
• Adaptation of the front panel hinge is recommended to ensure complete containment in Class III mode.
• This versatile biohazard hood offers a viable solution for diverse laboratory biosafety needs.