You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.

Smoke from kitchen and warm air being lighter rise up. If there is no outlet like ventilators, it will be difficult to escape for warm air and will heat up the room and could cause suffocation and discomfort.

https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-8/