The document discusses natural ventilation, which supplies and removes air through buildings using two types: wind-driven ventilation and stack effect ventilation without using fans. Wind-driven ventilation uses wind outside to push air through openings while stack effect relies on warm air rising and cooler air falling to circulate air. Natural ventilation is more economic with no maintenance or electricity costs but depends on weather conditions, allowing same temperature air inside. Mechanical ventilation uses fans for consistent air circulation but has higher installation, operation and maintenance expenses.

1. Natural ventilation
GROUP MEMBERS :
Muhammad Syarifuddin Abd Ghafar
Mohd Fakhru ‘Izzat b. Azit
Kamarul Aiman b. Abdullah
Nurafida bt Mohd Ali
Sharifah Rashidah bt Syed Salim
Siti Masyitah bt Mohd Kassim
Nur Aqilah bt Ibrahim

2. Ventilation

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4. Wind driven

7. Stack effect

11. Advantages

12. Disadvantages

13. Comparison
MECHANICAL NATURAL
Use fan Not use any fan
Need to be install Ready fix to building
Allow warmer air escape faster Depend on weather
High cost More economic
High maintenance No maintenance
Create air all time Same in temperature
Noise Silent
High electricity bill No electricity bill

15. Conclusion