Preparing airflow intelligence
Calibrating industrial-grade components and rendering the next section.
A systematic approach to choosing between centrifugal and axial fan types for industrial applications.
The choice between centrifugal and axial fans is one of the most fundamental decisions in industrial ventilation design. Each type has distinct performance characteristics making them suited to different applications.
Centrifugal fans develop pressure through centrifugal force acting on the air as it passes through the rotating impeller. They are capable of generating high static pressures (up to 120" wg for industrial blowers) and handle moderate to high resistance systems.
Axial fans move air parallel to the fan shaft using aerodynamic lift on the rotating blades. They excel at high volume, low pressure applications — typically below 8" wg — and achieve higher efficiencies than centrifugal fans in this range.
The specific speed (Ns) is the key parameter for fan type selection. Specific speed below 1,500 RPM favors centrifugal fans; above 4,000 RPM favors axial fans; the 1,500–4,000 range is served by mixed flow fans.
Physical space constraints often influence the selection. Axial fans have a compact inline profile ideal for duct mounting, while centrifugal fans require more floor space but offer greater flexibility in inlet/outlet orientation.
Total cost of ownership should include energy costs over the fan's 20-year design life. A centrifugal fan with 82% efficiency versus an axial fan with 88% efficiency on a 200HP application represents approximately $45,000 in additional energy costs over 20 years.
