I dont speak for Festool or Oneida, but there have been cases in the past where CT Vac circuit boards were fried while using the Dust Deputy, I think it was a static issue, not an overheating issue. Oneida made some revisions to the Dust Deputy to address static issues. Festool however, will most likely tell you that they cant comment on, or recommend, aftermarket add on parts, and your warranty may be called into question as well, should a repair to the CT Vac be needed for this reason ---
That said, I know there are plenty of Dust Deputy / CT combo users out there-