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== Ventilation == Fires can spread through the interior of a structure as the hot [[gas]]es spread due to the expansion of the gases as a result of the combustion. Some fires can be partially controlled by venting these gases to the outside through manufactured heat vents in the structure's roof, or by the fire department cutting holes in the roof. Ventilation is important when it comes to the fire service, since it is "the systematic removal or heat, smoke and fire gases from a structure". The main purpose for ventilating a fire is to decrease the likelihood of a [[flashover]] from occurring.<ref name=":1">{{Cite web|date=2012-05-01|title=The Why & When of Ventilation|url=https://firerescuemagazine.firefighternation.com/2012/05/01/the-why-when-of-ventilation/|access-date=2020-10-08|website=Fire Rescue Magazine|language=en-US|archive-date=2020-10-01|archive-url=https://web.archive.org/web/20201001132931/https://firerescuemagazine.firefighternation.com/2012/05/01/the-why-when-of-ventilation/|url-status=dead}}</ref> The best time to ventilate is before sending anyone into a structure so that the path the fire will take is through the roof and not through the front door when firefighters open it, allowing more oxygen to feed the fire.<ref name=":1" />
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