As an AI language model, I don't have access to precise information about duplex villa ventilation systems, as it would depend on the specific design and architecture of each villa. However, here are some common types of ventilation systems used in residential buildings, which could be applicable to duplex villas as well:
1. Natural ventilation: This method uses natural airflows to circulate air through the building. It can be achieved through open windows, doors, and vents, and is effective in mild climates.
2. Mechanical ventilation: These systems use mechanical fans to circulate air within the building. These fans could be installed in the form of exhaust fans, supply fans, or balanced systems that combine both.
3. Heat recovery ventilation (HRV): This system uses a heat exchanger to transfer heat from the outgoing air to the incoming air, thus improving energy efficiency.
4. Air conditioning: Though not technically a ventilation system, air conditioning does provide some level of fresh air circulation and can help filter pollutants from the air.
5. Controlled ventilation: These systems use sensors and timers to control the amount and timing of ventilation based on factors such as occupancy levels and outdoor air quality.
The specific type of ventilation system used in a duplex villa would depend on the climate, building design, and personal preferences of the occupants.
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