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Related Experiment Videos

Required response time for variable air volume fume hood controllers.

L E Ekberg1, J Melin

  • 1Department of Building Services Engineering, Chalmers University of Technology, S-412 96 Göteborg, Sweden. le@vsect.chalmers.se

The Annals of Occupational Hygiene
|March 16, 2000
PubMed
Summary

Rapid control of fume hood exhaust airflow is crucial for laboratory safety. Re-establishing airflow within 1-2 seconds of sash opening prevents contaminant leakage and protects personnel.

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Area of Science:

  • Occupational Health and Safety
  • Chemical Engineering
  • Environmental Monitoring

Background:

  • Fume hoods are essential for laboratory safety, controlling airborne contaminants.
  • Inadequate exhaust airflow can lead to the escape of hazardous substances.
  • Timely control of airflow is critical to maintain containment.

Purpose of the Study:

  • To determine the required speed for exhaust airflow control in fume hoods.
  • To assess the risk of contaminant leakage based on airflow response time.
  • To evaluate the safety implications of delayed airflow re-establishment.

Main Methods:

  • Tracer gas (dinitrogen oxide) measurements using an infra-red gas analyzer.
  • Simultaneous measurement of face velocity and damper control signals.

Related Experiment Videos

  • Controlled laboratory environment with a single fume hood.

    • Main Results:

    • Increased tracer gas leakage observed when airflow is not re-established within 1-2 seconds.
    • Fume hood safety function is compromised if the delay exceeds 3 seconds.
    • Ideal conditions showed a 1-2 second response time is needed.

    Conclusions:

    • Fume hood control systems must respond within 1-2 seconds to prevent contaminant release.
    • Under typical conditions, faster response times are necessary due to external perturbations.
    • Rapid airflow control is vital for maintaining effective fume hood containment and personnel safety.