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Room are provided with the ventilators n...

Room are provided with the ventilators near the roof. Why?

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The air we breath out is harmful impure air and is warm, so it is lighter. It rises upwards in a room and can go out through the ventilators provided near the roof of the room. The cold fresh air enters the room through doors and windows, resulting the convention currents of air in the room. due to it, we feel comfortabel in the room.
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