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The UNE 100166:2025 Standard Air conditioning. Ventilation for parking updates the technical requirements for the design and sizing of these systems, incorporating efficiency and safety improvements.
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Its revision involved the participation of leading associations and organizations in the sector, under the framework of the UNE HVAC Committee (CTN-UNE 100).
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This new version replaces the 2019 edition and introduces changes in areas such as assisted mechanical ventilation, the arrangement of openings, and overpressure in evacuation routes.
Madrid, 23 October 2025.
The Spanish Association for Standardization (UNE) has published the new version of Standard UNE 100166:2025, Air conditioning. Ventilation for parking, which updates the technical criteria applicable to garage and parking ventilation systems, in line with the provisions of the Technical Building Code (CTE).
The document was developed within the UNE HVAC Committee (CTN-UNE 100), whose secretariat is held by the Association of Air Conditioning Equipment Manufacturers (AFEC). Experts from leading industry organizations participated in its drafting, including AEDICI, ATECYR, COAM, IETCC, Sodeca, Soler & Palau, and TECNIFUEGO, with the initial support of ANFACA.
The new version of the standard, which supersedes the 2019 edition, introduces improvements that provide greater technical precision and consistency in the design of ventilation systems, particularly in mechanically assisted ventilation systems using impulse ventilation.
Among the main updates, the text clarifies the criteria for the design flow rate for mechanical extraction, revises the arrangement of air intake and exhaust openings, and updates recommendations regarding overpressure in doors along evacuation routes. It also includes two informative annexes with practical examples illustrating the estimated calculation of occupant evacuation time and the determination of sprinkler activation time.
The final draft was reviewed by the UNE Fire Safety Committee (CTN-UNE 23) and approved by the Plenary of CTN-UNE 100, which comprises over 50 representatives from laboratories, associations, companies, and public entities. With this update, UNE reinforces its commitment to safety, efficiency, and sustainability in installations, providing technical tools that promote regulatory compliance and continuous improvement in building design.
