California Mandatory Regulation for Fume Hood Sash Closers and Exhaust Contaminant Measurement

Victor Neuman, Laboratory Exhaust Certification

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The California State Energy Code, Title 24, started mandating fume hood sash closers and exhaust contaminant measurement starting January 1, 2020. This presentation will explain the specifics of the new regulations. In addition, it will present the backup data from Rogers, Valmiki and Ling of AESC that was used to justify the adoption of these tough new measures. The author was consulted on the drafting of the standard through several interviews with the State of California representatives.

California calculates that on average the fume hood measures have a Benefit to Cost Ratio (BCR) fo 3.4. Measures have to have a BCR greater than 1 to be adopted. The measures for fume hood sash closers apply to laboratories that are fume hood intensive. However, a single 6' fume hood in a lab measuring 30'x30'x10' high could be considered fume hood intensive. The presentation will also include energy saving and first cost calculations for a range of paybacks.

Learning Objectives

  • Understand the requirements for fume hood intensive labs as mandated by the state of California Energy Code.;
  • Understand the costs and benefits of fume hood sash closers;
  • Learn about controlling fume hood exhausts by wind speed and direction; and
  • Have a better understanding of how to increase lab safety and sustainability both at the same time.


Victor Neuman is a professional engineer who has specialized in laboratory ventilation and fume hoods since 1983 when he joined Earl Walls Associates for 6 years. He has designed and constructed over 100 laboratory building and is founding vice-chair of ASHRAE's Laboratory Technical Committee. He presently has his own firm, Laboratory Exhaust Certification.


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