We touched on Blast cabinets on another thread, So I decided to add this one. I have a 40# free standing HF unit that worked ok. I did fully caulk it when I assembled it, helps keeps dust down. I haven't been super happy with gun seemed to stop up a lot, contributed it to moisture but I didn't think it could be all the problem. I am using Black Beauty (coal). So i decide to try upgrading the gun and bought the Skat upgrade kit, gun and siphon tube. WOW what a difference.