Quote Originally Posted by scott9116
Has any one used heat/ac duct as wall covering, you know the kind that folds up into those square ducts? Mylar on one side yellow fiberglass insulation on the other about 1" thick. My grow room is completely sealed up from the rest of my house secret door etc. I do get some smell I think from opening the door. But,y problem is noise, odd fan like noise coming from a wall in the bathroom, can't hear it over the bathroom fan but when it's not on there is noticeable noise from the room. I wonder if this insulated mylar would kill enough noise.
Get some foam for the area around the fan, or insulate your grow room. Imagine your plant is a mic and make a sound proof box for it. at least a deflector. Also if your fan is mounted somewhere you may want to make a shock of some type cause it may be causing noise from vibration. The bed foam from wal-mart works I guess, the thicker the better.
Hope I helped. google sound foam to research