Ventilators are provided near the ceiling of the room because
1). the exhaled warmer air rises up and goes out
2). these provide cross ventilation in the room
3). these provide some sunlight in the room
4). these do not look nice in the lower part
Ventilators are provided near the ceiling of the rooms in our houses because the air we breathe out is warm and the warm air being less dense than cold air,rises and go out through the ventilators.
So, the correct option is,
1). The exhaled warmer air rises up and goes out.
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