What Is the Minimum Suction Pressure in Axial Fans

The minimum suction pressure in axial fans is typically around -100 mmWG (millimeters of water gauge), which is equivalent to approximately -980 Pascals or -0.14 psi.

Axial fans are designed to move air parallel to the fan’s shaft, creating a pressure differential between the inlet and outlet. The minimum suction pressure is the lowest pressure that can be achieved at the fan’s inlet while still maintaining proper airflo

It is essential to maintain an adequate minimum suction pressure to prevent issues such as reduced airflow, increased turbulence, and potential damage to the fan or connected equipment. However, excessively low suction pressures can lead to problems like fan instability, vibration, and noise.

In some cases, specialized axial fans designed for high-pressure applications or systems with high resistance may have lower minimum suction pressures, but -100 mmWG is a common benchmark for many standard axial fan applications.