417.0 Testing and Balancing Airborne Infection Isola-tion Rooms and Protective Environment Rooms — 2025 California Mechanical Code
California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-09-25 · California
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Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Mechanical Code (Title 24, Part 4) § 417.0 · Effective January 1, 2026 · Official source: Building Standards Commission
tion Rooms and Protective Environment Rooms.
[OSHPD 1, 2, 3, 4 & 5] Prior to acceptance of the rooms, all
mechanical systems shall be tested, balanced, and operated to demonstrate to the owner or designated representative that the installation and performance of the systems conform to design intent. All testing and balancing shall be performed by a qualified independent agency certified by the Associated Air Balance Council (AABC): the National Environmental Bal- ancing Bureau (NEBB); or the Testing, Adjusting and Bal- ancing Bureau (TABB). Air balance testing shall include a pressure test at all doors serving the isolation, protective envi- ronment, and ante rooms to provide the directional pressure relationships in Section 416.1.
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