I am putting a simulator in my new garage. Before I installed vapor barrier and drywall, I ran some central vac tubing in the attic for running wires for my setup and any changes that I would need to make in the future. I thought that using the long 90s would be fine and while it is for smaller wires like network cable, it's not so much for thicker ones. I ordered a 3.5 mm audio cable to go from the projector to the sound bar and I couldn't pull it through the tubing. Ended up having to go into the attic and take the tubing apart (didn't glue it thankfully) and run the cable manually.
So just a piece of advice not to make the same mistake as me and use 45 degree joints when running your tubing instead of 90s wherever possible.
So just a piece of advice not to make the same mistake as me and use 45 degree joints when running your tubing instead of 90s wherever possible.