ventilation in room is due to convection.why?

Yes.Ventilation is extremely necessary as it circulates air in the house. In this process, convection has the major role, which takes place only in liquids and gases.
There is a constant supply of fresh air and this removes the air present before. If there was no ventilation then the room might stink and there can be a feeling of stuffiness. In the room when air is hot its density decreases and rises up. So ventilators help to move out hot air from the room and lower its temperature.

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