Getting rid of unwanted noise is why I love Adobe Audition*. I record in my office/studio where I have the air conditioner going, or heater in winter, two computers humming away ... As long as I record a few seconds of 'silence' (which is really all the fan noise going on), I can use the 'Noise Reduction' feature. You select the silence, it analyzes it, then you select the whole track and click OK and it goes through it all and removes the noise from the whole track. It's like magic ...
*I'm sure others have this feature as well.
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