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). | |
Chimney | no | yes | very simple | simple | medium | Climate and wind depending. | |
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. |