Appendix 18. Advantages and disadvantages of ventilation techniques

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      Installation/ equipment Climate Technical considerations Cost Comments
    Cold Hot Assessment/ calculation Installation/ maintenance

    Natural ventilation

    Windows and doors

    no

    yes

    simple

    very simple

    low

    Wind depending. No guarantee on direction intensity and frequency.

    Whirly birds

    no

    yes

    very simple

    very simple

    low

    Wind depending (no electricity needed).
    No guarantee on intensity and frequency.

    Chimney

    no

    yes

    very simple

    simple

    medium

    Climate and wind depending.
    No guarantee on intensity.

    Assisted natural ventilation

    Ceiling, wall and desk fans

    no

    yes

    simple

    simple

    low

    Improve dilution. Needs small energy power.

    Extractors/ exhaust fans

    no

    yes

    simple

    very simple

    low

    Small energy power needed. Could be solar power (R&D).

    Mechanical

    Heating ventilation and air conditioning

    yes

    ideal

    difficult

    difficult

    high

    Relative pressure between rooms. High consumption of energy. Could need filter, HEPA filter and heat exchange.