Question

How does a ventilator help in circulating fresh air in a room?​

Answer 1

Ventilation are usually found at the top of the walls in the room . There is a reason for that . Hot air is less dense and rises up and moves outside the ventilator. Cold air moves from the window which are found on the lower part of the wall . The cold air entering the room becomes hot and rises up . The cycle continues and keeps the room cooler.