What is the supplying source for the RAMFAN?

The correct choice regarding the supplying source for the RAMFAN is rooted in the specifications and operational requirements of the fan itself. The RAMFAN is designed to operate efficiently with a specific size and pressure range of the hose to ensure that it receives adequate water flow and pressure for optimal performance.

A 1.5 inch fire hose at 40 to 180 psi is suitable because it provides a balance between sufficient water volume and pressure that the RAMFAN needs to achieve effective ventilation and air movement. This hose size enables the fan to generate the necessary airflow, which is critical in firefighting or emergency situations where the movement of smoke and harmful gases must be managed effectively.

In comparison to the other options, a 1 inch fire hose may not supply enough volume, while a 2 inch hose could provide excessive flow that the fan does not require. Additionally, the choice of a 1.5 inch hose paired with a pressure range lower than 40 psi would not meet the starting pressure needed for effective operation, indicating the importance of selecting specifications that precisely match the fan's operational design.