True or False? In commercial buildings and multistory structures, the attack hose should consist of 2.5 inch lines with smooth-bore nozzles.

The statement is true because in commercial buildings and multistory structures, the use of 2.5-inch attack hoses with smooth-bore nozzles is a common practice. This configuration provides higher flow rates and better reach, which are necessary for effectively combating fires in larger and taller structures. The larger diameter of the hose allows for increased water volume, which is critical in firefighting tactics for commercial and multistory buildings where fires can be more extensive and challenging to manage.

Smooth-bore nozzles are preferred in these situations because they produce a solid, straight stream of water that can penetrate deeper into the fire zone, allowing firefighters to attack the fire more aggressively and efficiently. The solid stream also minimizes the risk of water vaporizing before reaching the fire, making it more effective in extinguishing flames.

Other options do not accurately reflect standard firefighting practices; for example, stating that it depends on the building's height could create ambiguity, as the use of 2.5-inch hoses and smooth-bore nozzles is generally recommended regardless of height for such structures, given that firefighting needs can vary but often require the robust flow and stream characteristics provided by this equipment.