Committee issues two formal interpretations on code scope and whole‑house ventilation
The committee approved two formal opinions: (1) the IRC/IMC cross‑reference applies as applicable under R403.6; and (2) for 2018 IMC/IRC ventilation language, fresh air must be ducted to each habitable space and group R‑2 multifamily expects balanced systems while other occupancies may use supply/exhaust/ERV combinations.
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On March 14, 2025, the Mechanical Ventilation, Plumbing and Energy Code Committee approved two formal interpretations clarifying how existing code language should be applied by local jurisdictions and permit reviewers.
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