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High Efficiency Fume Hoods in Laboratory Spaces


Codes and Standards Enhancement (CASE) Report

The Statewide CASE Team is requesting feedback on the 2019 Title 24, Part 6 Draft CASE Reports. The CASE Report presents pertinent information that supports the code change proposal. Please email feedback to You may also submit written comments to the Energy Commission. See the agenda for Energy Commission pre-rulemaking workshop (available here) for instructions on how to submit comments to the Energy Commission’s docket.

 Draft CASE Report: High Efficiency Fume Hoods in Laboratory Spaces

Measure Description

The High Efficiency Fume Hoods in Laboratory Spaces measure proposes a prescriptive requirement for the installation of automatic sash closure systems for laboratory fume hoods with variable exhaust systems. This measure will apply to new construction as well as additions or alterations. The proposed measure is intended for laboratory spaces where ventilation requirements are fume hood driven. The standards prescriptively require variable exhaust and make-up airflow for laboratory buildings meeting certain design criteria. The proposed measure does not modify existing requirements for variable exhaust and make-up airflow, but rather appends to it to ensure energy savings are achieved from the variable exhaust system. Automated sash closure systems detect the presence of laboratory technicians in front of the fume hood via an infrared occupancy sensor. When no occupancy is detected for a predefined period of time, the sash automatically lowers, thus reducing exhaust air. The proposed measure aims to reduce the overall airflow through fume hoods that will result in energy savings associated with the fume hoods as well as with the HVAC system supplying conditioned air to the laboratory spaces where the hoods are located. The proposed measure is not recommending revisions to minimum face velocity requirements; rather, it saves energy by reducing area of sash opening while maintaining constant face velocity.

California Statewide Utility Codes and Standards Program

This program is funded by California utility customers and administered by Pacific Gas and Electric Company, Southern California Edison, San Diego Gas and Electric Company, Southern California Gas Company, Sacramento Municipal District, and Los Angeles Department of Water and Power in preparation for the California Energy Commission’s Codes and Standards Buildings Advocacy.