Why a duck? (Viaduct)

Silly title, I know.

I started working on the ducts for my cyclone dust collection system for the workshop. The main pipes are 6 inch PVC with various "Y" and "elbow" connectors. Nothing difficult, just measure, cut, fit, adjust. I bought more pipe than needed in case of mistakes. The main duct is to be suspended by ropes from the ceiling as it runs diagonally overhead. There will be 4 "Y"s to various machines and the end of the main line will go to the lathe. Everything slips together, but I will add screws at each connection and caulk all the joints to make it more air tight.

Still several weeks away from having it all in place. Then I need an electrician to come and wire up the 220 motor. So, will probably be running this fall. Progress pictures soon.