Compared to radial fans, axial fans generally require?

Axial fans are designed to move air along the axis of the fan, creating a flow that is generally more efficient for lower pressure applications. When comparing them to radial fans, which work by drawing air into the fan and forcing it outward at a right angle, axial fans typically operate at lower pressure levels. This allows axial fans to require less power at maximum air delivery because they do not need to overcome as much static pressure or resistance in the system.

This efficiency in power usage at high flow rates makes axial fans preferable for applications where high volumes of airflow are needed without the requirement for pressurizing the air as much as radial fans do. Thus, the correct option emphasizes that while both types of fans may be used in various applications, the fundamental design and operational principles of axial fans lead to their lower power requirements at maximum air delivery when compared to radial fans.