I found one of these on CL here in Ral in 2007, only 1/2 mile from the house! This is a great air cleaner and it is hung in my garshop. I think the dust has been reduced by 50% or more since I hung it. Do not expect it to perform miracles - but it will help. The filters are a mongrel size and do not accept standard furnace filters. Therefore, you have no choice but to go back to the mfr. And naturally, they are ungodly expensive. Even though you can wash out the nylon mesh, they will need to be replaced at some point. But don't let that stop you from a truly great but and a great tool to add to your shop ...