What is the best approach for a firefighter when dealing with a flammable gas fire?

Using two 1¾" hose lines from the side is the best approach for dealing with a flammable gas fire due to several critical factors. First, this tactic provides a wider coverage area, allowing firefighters to effectively manage the fire while minimizing the risk of exposure to the flammable vapors. The use of two lines also increases the water output and pressure at the nozzle, which can be essential for extinguishing highly flammable materials and preventing the fire from spreading.

Additionally, positioning the hose lines to attack from the side can better control the fire's movement and potentially shield firefighters from direct flame and heat exposure. This method also helps in maintaining a safer distance from ignition sources while still being able to effectively suppress the flames.

Furthermore, using multiple lines allows for a coordinated attack, enhancing the overall effectiveness and safety of the firefighting operation. This approach reduces the likelihood of re-ignition, which is a significant concern with flammable gas fires, ensuring that all possible angles are covered during the attack.