Which of the following factors is NOT considered when calculating friction loss?

When calculating friction loss in a fire service context, factors like the length of the hose, the flow rate of water, and the coefficient for the specific hose type are integral to determining the friction loss that occurs as water travels through the hose.

The length of the hose directly impacts friction loss since longer hoses will create more resistance to the flow of water. The flow rate of water is also a critical factor; increased flow rates generally lead to increased friction loss due to the turbulence created within the hose. Additionally, the coefficient for the specific hose type accounts for variations in design and material, which can affect how much friction occurs.

In contrast, the height of the building is not directly related to friction loss. While it does influence other aspects of firefighting operations, such as required pumping pressures and elevation differentials, it does not factor into the calculations of friction loss within the hose itself. Therefore, the height of the building is not considered when calculating friction loss.