Ventilation is necessary in every home. It is what keeps your attic from overheating and your roof from being damaged. It is the process of moving hot, stale air from the attic and re-circulating fresh air into it. This is usually done with a hi-volume steady air flow.
Because heat rises and inadvertently winds up in the attic of a home in the summertime, a lack of ventilation can not only damage the roof of a home, but can also be considered a potential fire hazard.
Ventilation is nothing but the movement of air inside and outside the house through vents. It serves the purpose of relieving the exhausted air from the room and bringing in the fresh cool air from outside. Attic ventilation works on the same lines as mentioned above. If the room is heated up, then hot air rises up and goes towards the roof of the room. A ventilator above the attic causes outer cool air to circulate in and the inner hot air to be evacuated.