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Nonresidential Reduced Infiltration

Measure Description

This CASE Report for reduced infiltration will introduce air tightness elements to the California building energy code since building air leakage testing is currently not a part of mandatory California building codes. This will help demonstrate compliance with the code by investigating two submeasures: air leakage testing and vestibule air leakage. The goal of this combined CASE Report is to eliminate excessive air leakage, especially in exterior entries (vestibules), and improve the overall energy efficiency of nonresidential spaces.  This CASE Report will support air leakage testing and will have a goal to reduce building leakage and as a result generate energy savings, potentially allowing for reduced HVAC equipment sizing, and support building comfort. Specifically, this measure would require the following actions.

Air-leakage Testing

This submeasure mandates air leakage testing and whole building air leakage shall not exceed 0.40 cubic feet per minute per square foot of the building thermal envelope area at a pressure differential of 75 Pascals.

Vestibule infiltration

This submeasure requires vestibules, and in particular revolving doors, to reduce air infiltration in main entryways of hotels, retail, restaurants, super markets, airports, and other building types with high occupant turnover.

Provide Feedback

Participate in the Utility-Sponsored Stakeholder meeting for this topic on November 5, 2019 ! View the event here.

This measure description will be updated as research is developed to support the 2022 code cycle. For questions or suggestions, email Include the measure name in the subject line.


Relevant Documents

Measure proposals, supporting documents, and other outside references will be made public as they become available.


Give Us Your Feedback

The Statewide CASE Team values input from all stakeholders engaged in the Title 24, Part 6 code change process. We encourage the open exchange of code change comments and concerns.

  • Use the form above to provide feedback on this measure.