Which type of ladder is primarily used for rescue operations?

The extension ladder is primarily used for rescue operations due to its design, which allows it to reach significant heights while still being stable and versatile. This type of ladder can be extended to various lengths, making it ideal for accessing upper floors of buildings during emergency situations, such as fires or rescues. Firefighters often need to reach windows or rooftops quickly, and the extension ladder can be positioned at different angles and heights, allowing for adaptability in various scenarios.

In contrast, the step ladder is generally more suited for tasks at a lower height and does not provide the necessary reach for rescue. The combination ladder, while versatile, typically serves more for general use than specific rescue operations. The attic ladder is designed primarily for access to attics and is not suitable for emergency rescues due to its limitations in height and load capacity. Thus, the extension ladder proves to be the best fit for rescue operations, emphasizing its importance in firefighting and rescue work.