Initially, the AFCI in the master bath was tripping intermittently. The Warantee Dept. sent an electrician. He said that AFCIs were too sensitive for the cheap arcing motors in the bathroom exhaust fans. I urged him to change out the one that was tripping, although he said that it would not make any difference. He had to put in an exact replacement. That was about a year ago, and the replacement has not tripped. So, maybe there are manufacturing tolerances from piece to piece.
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