Question

explain why ventilators are provided near the roof of rooms in our houses?

Answer 1

to provide fresh air to come in and hot and bad air to go to of the room because hot air is lighter and therefore goes up and escapes from ventilators and cool air from the atmosphere come inside the room because in room there is low pressure when hot air escapes so it enters the room through ventilators.

Answer 2

A hot air is lighter than cold air relatively ,
it goes up near ceilling and pass tgrough ventilators, As the hot air passes through ventilators relatively cold air finds its path from windows and cool the room.