DLB wrote
I got confused somewhere along the line. If I take the 3 X 2.5 plenum (manifold?) off of the DC-3300 do I have a 4" port? Or only if I adapt it with the unobtanium SS port or make something? I think the 4" line may work for my application, a DW735 Planer that adds considerable airflow on the front end, despite the relatively low flow of the 3300. And I don't need a long line, both tools are portable.
Note - Though the manual says 4", the standard adapter that comes with the DW735 will connect directly to either 2.5 or 4. I have not experienced any problems with 2.5" so far.
- David
David,
It has been a while since I measured mine, but yes you will get a 4.x" opening on the DC-3300 by removing the plenum/manifold from the front. Mine is up in the attic now, so I can't easily go measure it, but it is around a 4" opening. I had planned to use 4" PVC for a very short trunk line of ducting in my shop. I believe I wrapped a 4" PVC line in some electrical tape in order to get a snug fit (and have it not get sucked into the impeller), so I think the DC-3300 opening is a little more than 4.5" (4" PVC has a 4.5" OD). The benefit, as I see it, of the 90°elbow from Shopsmith is the elbow permanently attaches to the DC-3300 (or DC-6000) with screws and has a flange to make it mostly airtight. By the way, when I took the plenum off of my DC-3300, that is the only time that my 42" filter hood ever fully inflated, so there is some restriction in the plenum (even if all 3 ports are open); makes sense because the area of 3 2.25" port is less than 1 4" port.