Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Keith E. Johnson0
Duane M. Johnson0
Date of Patent
January 27, 2009
Patent Application Number
11097420
Date Filed
April 1, 2005
Patent Primary Examiner
Patent abstract
A control system for disabling the fan of a heating, ventilating, and air-conditioning system upon the detection of an audible alarm, such as a smoke alarm. The preferred embodiment utilizes a tunable band pass filter/decibel level detector in conjunction with a microphone to detect an audible alarm. When an alarm is detected, the fan is disabled whether the HVAC is operating in heating, cooling, or manual fan “on” mode.
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