I can't speak to the complaint. That said your modules are... interesting, but tbh kind of cool. Kudos for thinking outside the box.
PS - If you built an Exhaust fan with case power and a switch to turn it off and on I would probably buy one just for some peace of mind.
-- troux
i can make the same module with a step down transformer so you can set it to run slower so the noise isnt too much. i dont think theyre loud but someone will. i try to keep my modules as cool as possible because performance can suffer when they get hot. *my computer modules i mean.