What action should be taken to ensure all areas around a window are completely extinguished after a fire?

To ensure that all areas around a window are completely extinguished after a fire, removing frames or casings is the most effective method. This action allows firefighters to access hidden areas that may still contain smoldering materials or embers. Fires can often penetrate into walls and spaces that are not visible, and simply relying on exterior observation might leave hot spots that could reignite.

By taking off the frames or casings, firefighters can better assess the extent of the damage and apply extinguishing agents directly where needed. It also helps in verifying that fire has not spread into concealed spaces around the window. This thorough approach is crucial in preventing re-ignition and ensuring the safety of the area.