why are ventilators made close to the ceilings (give reasons)

In the room when air is hot its density decrease and rises up. So ventilators help to remove out hot air from the room and make its temperature same.  So,ventilators are made close to the ceiling.

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The air we exhale is hot. Hot air has less density. So it rises up. So hot air will b present close to the ceilings. So ventilators are constructed so.

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