my fan is quite noisy, but once i attatch it to the hosing, and cover that all in the thick plastic i use for light reflection (i don't use mylar...this stuff is much thicker) it deafens the sound almost completely. so even if u do get a noisy fan, there are ways to quiet it. (if you really wanted to go all out, you could wrap your hosing/vent system with material to muffle the sound)