1305.2 Minimum Flow Rates — 2025 California Plumbing Code

California Plumbing Code (Title 24, Part 5) · 2025 edition · updated 2026-10-23 · 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 Plumbing Code (Title 24, Part 5) § 1305.2 · Effective January 1, 2026 · Official source: Building Standards Commission

Medical gas and vacuum systems shall be capable of supplying the flow rates listed in Table 1305.2.

TABLE 1305.2

MINIMUM FLOW RATES (cubic feet per minute)

MEDICAL SYSTEM	FLOW RATE
Oxygen	0.71 CFM per outlet1
Nitrous Oxide	0.71 CFM per outlet1
Medical Compressed Air	0.71 CFM per outlet1
Nitrogen	15 CFM free air per outlet
Vacuum	1 SCFM per inlet2
Carbon Dioxide	0.71 CFM per outlet1
Helium	0.71 CFM per outlet

For SI units: 1 cubic foot per minute (CFM) = 0.47 L/s

Notes: 1 A room designed for a permanently located respiratory ventilator or anesthesia machine shall have an outlet capable of a flow rate of 6.36 CFM (3.0 L/s) at the station outlet. 2 For testing and certification purposes, individual station inlets shall be capable of a flow rate of 3 SCFM (1.4 L/s), while maintaining a system pressure of not less than 12 inches of mercury (41 kPa) at the nearest adjacent vacuum inlet.

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California Plumbing Code (Title 24, Part 5)

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