Appendix 25. Overview of ventilation techniques

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    Update: October 2023

     

    Ventilation

    Equipment

    Installation

     Maintenance

    Cost

    Remarks

    Natural 

    Windows and doors 

    Very simple 

    Low 
    • Adapted to hot climates only.  
    • No constant airflow speed and direction.  

    Whirly birds 

    Very simple 

    Low 

    Assisted natural 

    Fans (ceiling, wall, desk) 

    Very simple 

    Low 
    • Adapted to hot climates only.  
    • Improves dilution.  
    • Power source required. 

    Extractors/ exhaust fans 

    Simple 

    Low 
    • Adapted to hot climates only.  
    • Power source required. 

    Mechanical 

    Heating, ventilation and air conditioning 

    Very difficult 

    (requires specialised technicians) 

    Very  

    high 
    • Adapted to cold and hot climates.  
    • Constant airflow speed and direction if functioning properly.  
    • Power source required (high consumption). 
    • HEPA filters if air is recirculated.  

     

    For more information on ventilation techniques, refer to specialised guidelines.

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