CPC F04D 29/661 (2013.01) [F04D 19/002 (2013.01); F04D 29/644 (2013.01)] | 41 Claims |
1. A propeller fan for a heating, ventilation and air conditioning (HVAC) unit, the propeller fan comprising:
a plurality of blades arranged in a concentric configuration, each of the plurality of blades comprising a leading edge, trailing edge, a suction side and a discharge side; and
a plurality of protrusions P configured on the suction side proximate the leading edge of at least one of the plurality of blades;
wherein the plurality of protrusions lowers sound pressure levels generated during operation of the propeller fan.
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