Deadly fires occur for a myriad of reasons, but the most deadly aspect of fires is how the product of combustion attacks the human respiratory system. Fires greatly reduce the amount of oxygen in the air and dump carbon monoxide into the area. A lack of oxygen and breathing in carbon monoxide are both deadly to humans. The best manner to prevent death by poisoning the blood through carbon monoxide inhalation or asphyxiation through a lack of oxygen is to ventilate the fire.
Although ventilation is vital to saving lives during a fire it also carries its own risks, which means that proper steps must be take to ensure that the ventilation is performed properly otherwise the fire will spread. Ventilation is merely the act of exposing the fire to fresh air, which allows smoke and carbon monoxide to escapes but also allowed the fire to grow. Fires need oxygen to propagate, so ventilation should ideally happen only after water is to being applied to the fire. This caused the negative effects of the ventilation to be negated as the positive effects help to fight the fire.
Proper ventilations of a fire should occur at the roof. Heat and smoke rise and will accumulate the pinnacle of a structure. Opening the roof will allow the heat and smoke to escape at a rapid pace. Ideally there will already be a way to ventilate the fire in the form of skylights or scuttle holes. But if there is not other way to ventilate the fire, then cutting holes into the roof is an effective way.
Any floor were smoke has accumulated should also be ventilated. Proper fire ventilation techniques call for opening all windows and doorways on the level of the fire and above. The best way to ventilate a fire is by providing a path directly above it. Ventilating above the fire in another location can drawn the fire to areas that would otherwise remain untouched. Proper fire ventilation training is vital to creating an effective firefighting unit.