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Multifamily Indoor Air Quality

Measure Description

This CASE Report will investigate the options to reduce energy use and improve indoor air quality (IAQ) in multifamily dwelling units. It will also evaluate the cost-effectiveness and feasibility of a mandatory compartmentalization air leakage requirement and develop a path for a multifamily building to conduct an infiltration test verified by HERS blower door testing on a sample of multifamily units per building or per floor. This CASE Report will include the following four submeasures.

  • Reduce infiltration.
  • Reduced leakage from central ventilation shafts.
  • Balanced ventilation and energy recovery ventilator/heat recovery ventilator prescriptive requirements for some Climate Zones and credit elsewhere.
  • Kitchen exhaust hood capture efficiency.

Central Ventilation Shaft Sealing

This submeasure will require that central ventilation shafts in new construction multifamily buildings be sealed within a maximum leakage rate and tested for compliance.

Heat or Energy Recovery Ventilation in Select Climate Zones

This submeasure is a prescriptive option for a heat recovery ventilator (HRV) or energy recovery ventilator (ERV) in certain climate zones.

Kitchen Range Hood Capture Efficiency

This submeasure proposes a requirement that kitchen range hoods in new multifamily units meet a minimum capture efficiency.

Relevant Documents

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

Submeasure Summaries

Provide Feedback

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.


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.