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The Characteristics of Forward Curve Fans

A forward curve fan, also known as a forward curved fan, has fan blades that curve into the direction of the rotation. If the fan turns clockwise, meaning that the blade turns right at the top of the rotation, the blade curves toward the left to the trailing, or back, edge in a straight line. These fans are used in a number of heating, venting and air conditioning (HVAC) applications. While these fans have utilization they also have their limitations.

  1. Air Flow Pattern

    • The forward curve fan is a centrifugal flow type. This means that the airflow changes twice: once when the air enters the fan and again when it leaves the fan. This type of air flow occurs with five types of fans in the centrifugal flow type that includes radial, backward curved and forward curve fans.

    Speed

    • The forward curve fan runs at a slower speed than most centrifugal flow type fans. This makes for a quieter fan along with less weight and less expense. However, this also leads to less efficiency and a need for the unit to be closely monitored.

    Typical Applications

    • These types of fans are commonly used in low-pressure HVAC units as well as packaged units. The forward curve fan does well in areas with clean air and gases. This type of fan accumulates dirt easily because of the multiple vanes and is not recommended for areas that have fumes or dust that sticks to the fan blades.

    Precautions

    • This style of fan requires careful driver selection as it speeds up during use. Poor speed control damages the fan motor if not properly controlled. This affects airflow as well, making it difficult to adjust air flow to a steady rate at all times. This fan should not be used with high pressure or harsh situations.

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