Working cooling fan taken from a 60gb CECHC PS3.  These have been reported to be compatible with the following models:-

CECHH / CECHJ 40gb

CECHK / CECHL / CECHM 80gb

CECHP 160gb

In addition, some users have reported upgrading their 15 blade fans in the 60gb CECHA and 20gb CECHB models.  However, the fan is not compatible with the CECHG 40gb version, which requires a longer cable.