1105.5 Ventilation of Rooms Containing Condensing Units — 2025 California Mechanical Code
California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-10-19 · 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) § 1105.5 · Effective January 1, 2026 · Official source: Building Standards Commission
Units. Where not in a refrigerant machinery room, rooms or spaces in which a refrigerant-containing portion of a condensing unit is installed shall be provided with ventilation in accordance with Section 1105.5.1 or Section 1105.5.2. Ventilation for machinery rooms shall comply with Section 1106.0.
1105.5.1 Permanent Gravity Ventilation Open- ings. Permanent gravity ventilation openings of not less
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than 2 square feet (0.2 m [2] ) net free area opening shall be terminated directly to the outside of the building or extend to the outside of the building by continuous ducts.
1105.5.2 Mechanical Exhaust System. A mechanical exhaust system shall be designed to provide a complete change of air not less than every 20 minutes in such room or space and shall discharge to the outside of the building.
Exceptions:
(1) A condensing unit in a room or space where the cubical content exceeds 1000 cubic feet per horsepower (ft [3] /hp) (37.95 m [3] /kW) of the unit.
(2) A condensing unit in a room or space that has permanent gravity ventilation having an area of 2 square feet (0.2 m [2] ) or more to other rooms or openings exceeding 1000 ft [3] /hp (37.95 m [3] /kW).
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