This presentation, delivered by Jukka Vasara of the Granlund Group on July 2, 2026, during CBT4 for HumanIC Doctoral Candidates, provides a comprehensive overview of hospital HVAC and ventilation design practices in the Nordic region. It focuses heavily on the implementation of the R3 Nordic Guideline, published in September 2023, which aims to protect patients and staff from harmful airborne agents. The document details strict cleanroom classifications, such as EN-ISO 14644-1 and GMP, and emphasizes that systems must be designed to avoid wet surfaces that promote microorganism growth. It also notes that HEPA filters must meet at least class ISO 35H.
Furthermore, the document outlines specific ventilation strategies for operating rooms (ORs) and isolation units. Operating rooms must maintain overpressure to direct airflow outward and are categorized by microbial cleanliness levels (CL1 and CL2) achieved through dilution mixing or protected zone principles. Finally, the presentation covers airborne isolation rooms, highlighting the critical role of airlocks acting as buffer zones. These airlocks require high airflow rates, targeting a 10:1 contamination dilution in under three minutes to safely manage infection risks.
