Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Ferdy Martinus0
William B. Rockwood0
Date of Patent
September 28, 2010
Patent Application Number
11356283
Date Filed
February 16, 2006
Patent Citations Received
Patent Primary Examiner
Patent abstract
A sound-abating flow disruptor quiets a PTAC refrigerant system by disturbing the airflow between an energized electric heater and an adjacent fan wheel. In some embodiments, the flow disruptor is a perforated metal plate that attenuates a whistle, which appears to be caused by vortex shedding in the confined area between the energized heater and the fan. In some cases, the heater comprises selectively energizable heating elements of various wattage. The heating elements closest to the fan wheel are the lower wattage ones to minimize the heat near the fan.
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