turn it down? im just playin......but be more specific...like is it too loud so that you cant sleep. too loud so that the neighbors hear it...roommates...what are you referring to...like could you possibly move it..ya know . there are always creative solutions.....
Suspend it with rubber or bungee cords for vibrations or you can make a sound proof box to house the fan in to cut down fan noise plus you can never go past insulated ducting it makes so much difference. You can also get a duct muffler or make one