<< I got a FOP-32 myself, didn't want the noise related with the 38. >>
While you have to admit the 26 CFM Y.S. Tech fan on the FOP-32 is also VERY loud (I know it from the FKP32).
I'm thinking about buying a FOP-32 myself, but I'm still looking for a shop which sells the HS without the fan, because I would rather want to use my 28 db(A) Papst fan than the Y.S. Tech monster.