“Left-Hand” and “Right-Hand” Concepts of Forward-Canted Centrifugal Fans

The “left-hand” and “right-hand” concepts of forward-canted centrifugal fans refer to the rotation direction of the propeller and the positioning of the fan’s outlet. The fan’s airflow directly impacts its energy efficiency. By adjusting the rotation and airflow direction, it can be fine-tuned within a certain range to enhance the fan’s economic performance.

Working Principle: The forward-canted centrifugal fan utilizes the temperature difference between the indoor and outdoor air to induce natural wind and thermoconvection, causing the turbine to rotate. The centrifugal force and negative pressure effect expel the hot air from the room.

Propeller Rotation Direction and Fan Outlet Angle: When selecting a forward-canted centrifugal fan, the rotation direction of the propeller is an important technical requirement. Specifically:

From the air intake perspective:

• Clockwise rotation (Right-Hand): The fan’s outlet is located at the lower left, with the air flowing horizontally to the right at an angle of 0°.
• Counterclockwise rotation (Left-Hand): The fan’s outlet is located at the lower right, with the air flowing horizontally to the left at an angle of 0°.

45° Angle Adjustment:

• Clockwise rotation (Right-Hand): The fan outlet is at the lower left, with air directed upwards at a 45° angle to the right.
• Counterclockwise rotation (Left-Hand): The fan outlet is at the lower right, with air directed upwards at a 45° angle to the left.

90° Angle Adjustment:

• Clockwise rotation (Right-Hand): The fan outlet is on the left side, and the air is expelled vertically (90°).
• Counterclockwise rotation (Left-Hand): The fan outlet is on the right side, and the air is expelled vertically (90°).

Selecting the Right Angle for Environmental Compatibility: The propeller angle of the forward-canted centrifugal fan is a selectable standard, usually determined based on the actual environmental conditions. To ensure the fan operates efficiently, selecting the right angle is essential for improving air circulation, increasing efficiency, and reducing energy consumption.