Abstract: The present invention is related to an exhaust fan, particularly to a fan applied to a personal computer (PC) or computer's power source unit (PSU). The exhaust fan includes base, blade and a second printed circuit board (PCB). The second PCB is disposed on a surface of the blade. A set of induction generator disposed to a joint of the blade joined to the base is electrically connected to the second PCB as a loop. An induced alternate current (AC) turned into direct current (DC) powers the second PCB instead of the mother board power source. Therefore, the low profile fan can be added to the PSU for a low clearance installment.