Well I’ve got to say, I cannot believe they placed a part we have to clean such as the back exhaust in such a manner that we cannot unscrew it and get to it. Anyway last night I clean the fan for about 10 hours because it was so full of gunk. I bought a new hose and attached it to the back. Today the sound of the glow Forge is so loud it sounds like an airplane is taking off next door. The fan is super loud and is blowing perfectly and the machine is almost vibrating.