GIVE REASON
1. A ventilator is a small window which is placed high up close to the ceiling of a room.
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The ventilators made close to the ceilings, because hot air is less dense compare cold air. Therefore, hot air moves up towards the ceiling and ventilators help to remove hot air from the room. It controls the temperature of room as the hot air is removed through ventilators and it decreases the temperature of room.
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