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There should be no reason for the knock sensors to react to noise from a blower. A weight is incorporated so that they are not sensitive to anything even remotely within the audio frequency range. Furthermore they a mounted to a large mass which would damp out extraneous indirect vibrations.
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Trevor, New Zealand.
As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! 
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