Which fan type is more efficient at moving larger volumes of air against a higher resistance?

The correct answer is centrifugal fan. This type of fan is designed to move air efficiently in situations where there is high resistance in the airflow system. Centrifugal fans use a rotating impeller to draw air into the center and then force it outward through a discharge. This design allows them to generate significant pressure, making them ideal for applications that require moving large volumes of air against resistance, such as duct systems or in environments where air needs to be pushed through filters or other obstructions.

Centrifugal fans are particularly well-suited for systems that require consistent airflow at higher pressures, such as heating, ventilation, and air conditioning (HVAC) applications. Their ability to maintain efficiency in such conditions is a key reason for their widespread use.

In contrast, radial fans are often considered a subtype of centrifugal fans but may not always be as effective in high-resistance applications as standard centrifugal designs. Axial fans, while capable of moving large volumes of air, are better suited for low-pressure applications where resistance is minimal. Plenum refers to a space or chamber used to distribute air rather than a fan type, so it doesn't apply to the question regarding types of fans and their efficiencies.