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HCAI details 2025 OSHPD amendments to California Mechanical Code, tightens ventilation and filtration rules
Summary
HCAI senior engineer Larry Enright reviewed OSHPD amendments to the 2025 California Mechanical Code including a new OSHPD 6 designation, alignment with the 2021 ASHRAE 170 standard, reorganization of ventilation tables, and a move to locate HEPA filters at the room’s air-terminal device for certain critical spaces.
Larry Enright, senior mechanical engineer in the Department of Health Care Access and Information(HCAI) building standards unit under OSHPD, presented proposed OSHPD amendments to the 2025 California Mechanical Code during a public webinar.
Enright said the package adds a new OSHPD designation, OSHPD 6, to coordinate mechanical provisions for chemical dependency recovery hospitals with California Building Code function requirements. "This coordinates with the California building and administrative codes for chemical dependency, which, chemical dependency recovery hospitals," he said, introducing OSHPD 6 and noting that most OSHPD 6 requirements will fall under model code provisions.
A major focus of the amendments is ventilation and filtration. The draft revisions align many local amendments with the 2021 edition of ASHRAE 170 and…
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