Which method is advised for spraying foam on vehicle fires?

The advised method for spraying foam on vehicle fires is utilizing a fog pattern no more than 30 degrees. This approach is effective because it allows for a combination of cooling and effective coverage of the fire area. The fog pattern helps to disperse the foam over a wider area, which enhances the likelihood of suppressing the fire by forming a blanket that separates the combustibles from the air.

Utilizing a fog pattern within this specified angle creates a mist that can capture and smother the volatile gases emitted by the fire. The combination of cooling effects from the water content and the smothering effect of the foam contributes to extinguishing the flames and preventing re-ignition. Additionally, this method helps to protect firefighters by preventing direct exposure to the intense heat.

The other methods, while they might have their specific applications, are not as effective for vehicle fires. For instance, using a direct stream would not provide the necessary spread to effectively suppress the flames in a fire that is often fuel-fed by flammable liquids and materials found in vehicles. Similarly, a wide beam pattern may not adequately cover the intense heat and volatile fuel situation, and spraying vertically does not capitalize on the benefits of foam application in suppressing fire and creating a protective foam layer.