Well, I've got insulation now in walls. I have inline fan insulated. I have exhaust pumping out house. The issue- I can go into upstairs bathroom and hear noise. I have located the loudest now coming from filter suction. It actually is the only place the fan noise is mostly heard along with a suction sound. Any way to muffle a carbon filter? I even added refectix insulation on top of r 13 insulation I put between grow room in bathroom. If I can get this, I am good. I know if I lowered the filter near floor it would help but I do not think that is best place for filter due to not pulling out heat as much, I suppose.