I'm using this before a standard inline bathroom extractor fan to filter sanding dust from the output of a paint extractor hood so I'm not constantly vacuuming the filter pads, or not throwing resin dust out the window. It does drop all the dust into the blue bucket. It's well built and only slightly fiddly to open and close. I'm very happy with it. The inlet and outlet are the wrong size for anything, so I've ordered some adapters to replace duct tape. I'll come back and edit in the parts I settle on.