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Related Experiment Videos

Open fronted safety cabinets in ventilated laboratories.

R P Clark1, R W Osborne, D C Pressey

  • 1Thermal Biology Group, Clinical Research Centre, Harrow, UK.

The Journal of Applied Bacteriology
|September 1, 1990
PubMed
Summary

Microbiological safety cabinets (MSCs) provide crucial operator protection. Adjusting laboratory ventilation systems ensures both Class I and II MSCs achieve high containment levels, even with environmental disturbances.

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Area of Science:

  • Microbiology
  • Laboratory Safety Engineering
  • Ventilation Systems

Background:

  • British Standard 5726 mandates specific operator protection factors (10^5) for open-fronted Class I and II microbiological safety cabinets (MSCs).
  • Naturally ventilated labs often meet these standards, but mechanically ventilated designs can create turbulence, compromising containment.
  • On-site commissioning tests are vital for verifying operator protection factors for all open-fronted MSCs.

Purpose of the Study:

  • To demonstrate that adjustments to air supply and exhaust systems can overcome environmental conditions that compromise MSC containment.
  • To show that Class I and II MSCs can achieve operator protection factors exceeding 10^5 when environmental conditions are optimized.
  • To analyze the impact of operator procedures and room disturbances on MSC containment and compare Class I and II cabinets.

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Main Methods:

  • On-site commissioning tests to determine operator protection factors.
  • Adjustments to laboratory air supply and exhaust systems.
  • Comparative analysis of Class I and II MSC performance under various environmental conditions and disturbances.

Main Results:

  • Optimized air supply and exhaust systems enable both Class I and II MSCs to achieve operator protection factors greater than 10^5.
  • When environmental conditions are compatible, operator working procedures and room disturbances affect both MSC types similarly.
  • Consistent performance is maintained over time with regular containment testing after initial performance is achieved.

Conclusions:

  • Compatibility between laboratory environments and MSCs is achievable through ventilation system adjustments.
  • Class I and II MSCs can provide equivalent high levels of operator protection when properly commissioned and maintained.
  • Future laboratory ventilation system design must prioritize compatibility with satisfactory safety cabinet performance, especially for high-risk work like handling HIV.