GRJ,
Would this be a good choice? Digi-Key: MF-R005-0-ND - 100mA trip, 50mA hold and 5 sec trip time.
If that is acceptable, I will add it to the parts list started in the other PTC thread.
Also, unless you have a better description for it, I will call it 'Suggested PTC for MTH smoke fan motors' (GRJ, WillyGee).