why do houses have ventilators?

Ventilation is extremely necessary as it circulates air in the house. 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. Ventilation is very useful for those people who are suffering from respiratory diseases. 

@Sandhyasingh: Very good! Keep it up.

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houses have ventilators for the ciculation of air the air which becomes hot (old) rises up and goes out from the ventilators and fresh air comes in through windows and doors and the process is repeated

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 plz  thumbs up

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i want d answer from an expert

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