Excellent product. I do wood working as a hobby, and create a lot of dust while sanding. I installed the fan in a window, set it for exhaust, the fan pulled out the dust and now I have virtually no dust particles when I do my finishing. After finishing the work, I wait about 20 minutes then turn the fan on to extract fumes from the room. The fan is very quiet and very efficient. I am thinking of getting another one for the other window in the shop.