Woodcrafters has duct work and some fittings, but if you are close to a
Woodcrafters store, look up a site The Wood & Shop, Inc. its got 3" and
4" stuff look under dust collection, they are in Maryland Height, Mo
just outside of St Louis...I have been putting a dust collecter on my
radial arm saw, and got a hood and reducter from Woodcrafts and using
some pvc pipe from Lowes to get it hooked up like I want it