Appendix 18. Advantages and disadvantages of ventilation techniques



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.