I have been asked to look at a pattiserie case because the noise from the condenser fans is much too loud, there are 4 small high speed fans ( almost like a papst fan ) the case is new so fans are not defective it's just the noise of the blades cutting through the air that's the problem ! Would a fan speed controller be an option ? Without affecting pressures too greatly ? Fans are also permanently fed which I found strange aswell. Compressor is a copeland scroll.

Thanks.