Belsaw dust collection
The steel chute was salvaged off an instant hot water heater.
Be careful of the swing of the planer handle. If this chute were placed any closer to the centerline of the cutterhead, the Belsaw crank handle would not clear the center port of the chute. You might get away with just making a 4” hole in the top of the planer, perhaps offsetting it in some way to not conflict with the swing of the crank handle.
In any case the chips won’t go straight up on their own. The Belsaw has a round steel deflector on the infeed end that throws the chips up and out the outfeed end. Simply putting a dust port on top won’t catch anything. An additional deflector is needed.
I used a couple of plywood wedges, a piece of lexan, 6 screws and duct tape to assemble the deflector and attach it to the planer. I made it a little too wide however and it is currently jammed into the planer between two metal parts. I should have made it with a bit more clearance so the planer top can be raised. As it is, I need to take off the deflector and cut it down by about 1/8”.