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Nonresidential Vestibule Requirement

Measure Description

This submeasure would require vestibules be installed in the main entryways of newly constructed nonresidential buildings in order to reduce air infiltration. Vestibules are most effective in achieving energy savings when they are installed in buildings with high occupant turnover. Vestibule installation has been a part of ASHRAE 90.1 and IECC Building Code for over a decade. Exceptions to the vestibule proposal will include air curtain or revolving door installation in addition to exceptions based on the size and location of the building.

In 2020, the Statewide CASE Team determined the measure would not result in sufficient savings within California climate zones.

Relevant Documents

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This measure description will be updated as research is developed to support the 2022 code cycle. For questions or suggestions, email info@title24stakeholders.com. Include the measure name in the subject line.

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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.

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