Strange Noises

[CornBread]

my filter is making a strange rattling noise from the impeller and motor area. i have cleaned the impeller, all the assembly parts, and inside the filter and still the noise. everything fits into place like it is supposed to so i am at a loss for words?????
any help would be appreciated

 

[Sab_Fan]

don't know if anyone can help, but it might be a good idea to mention what kind of filter it is . . .