Inlet Vanes

period four

Fan Modulation

notes

inlet vanes

supply fan

Figure 83

Inlet vanes modulate the capacity of a fan by “pre-swirling” the air in the direction of fan wheel rotation before it enters the wheel.

By changing the angle of air entry into the fan, the modulating inlet vanes lessen the ability of the fan wheel to “bite” the air. This reduces the airflow capacity which, in turn, reduces the power consumption and the ability to generate static pressure.

Inlet Vanes

static pressure

actual system resistance curve

design system resistance curve

inlet vane

position (%)

80% 90% 100%

airflow	Figure 84

This illustrates how inlet vanes control the fan operating point so that it tracks the desired modulation curve in response to reduced airflow and rising system static pressure.

By closing the inlet vanes, the performance curve for the fan shifts downward. The airflow and resulting static pressure fall until the operating point balances along the fan modulation curve (B).

60	TRG-TRC014-EN

TRG-TRC014-EN specifications

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