Thought I'd share this with the gang here. I bought a Felder FD250 machine recently and have been working toward setting it up. The dust port measures 3.160" OD which equates to about 80mm.

I put a run of duct together at the beginning of the year assuming I would adding a machine at the one location and so I put a fitting in for 5" hose. I presumed it would be a planer, but instead it is this Felder machine. I wanted to stick with 5" hose.

I find class 200 series PVC pipe, ID is 3.166" OD 3.5". I plan to cut this and use it as a bushing.

I then found a water pipe reducer nominal size 3" to nominal size 4". Actual size is 5" OD on the large end and 3.516" ID on the small size.

SO...hopefully this works out If it does I will post a photo.

I noticed a few threads on this with no reasonably solution presented outside of reducing at the duct. I don't have the room to do so, and if I did I wasn't interested to pay $85 + shipping for a simple reducer.