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Earlier editions: 20222019

Appendix A4

A4.506 Indoor Air Quality and Exhaust — 2025 California Green Building Standards Code

California Green Building Standards Code (Title 24, Part 11) · 2025 edition · updated 2026-10-19 · California

CBSC: official editions, supplements and errata

Cite as: 2025 California Green Building Standards Code (Title 24, Part 11) § A4.506 · Effective January 1, 2026 · Official source: Building Standards Commission

A4.506.1 Reserved.

A4.506.2 Construction filter. [HR] Provide filters on return air openings rated at MERV 8 or higher during construction.

A4.506.3 Direct-vent appliances. Direct-vent heating and cooling equipment shall be utilized if the equipment will be located in the conditioned space or install the space heating and water heating equipment in an isolated mechanical room.

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▸Contents — California Green Building Standards Code (Title 24, Part 11)
California Green Building Standards Code (Title 24, Part 11)

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