I wanted to build a cyclone for my newly installed Harbor Freight 2 Horse Power Dust Collector. After much research I decided to go with Phil Thiens Cyclone Separator Lid I am very happy with my decision. If you decide to make your own, head over to his site. The instructions are great.
Here is a shot of my lid upside down. I wanted to show the cutout and the elbow.
Here is a shot in between the lid and the baffle, All my plumbing is 4 inch.
Here is the completed product filling the void of my HF dust collector modification. The hose between the impeller and lid is 5 inch, I cut another piece of the hose that came with the Harbor Freight Dust Collector. It is a 5 to 4 inch reducer stuffed in the lid and there are clamps holding it in place, they are just not shown.
Again, I am pretty happy with the results.





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