First a bit of background. I'm building a movie theater in my basement, but the walls are owens finishing system (insuation with fabric), so mounting anything to the walls is impossible. I want to hang 3 movie poster frames on the back wall. I had an idea yesterday, but before I start cutting I need to determine if it will work. Hopefully this is an easy engineering calc, just a bit beyond my expertise.
I am installing kitchen cabinets on the back wall, with full height cabinets on the left and right side leaving 8' in the middle for counter height cabinets.
I would like to attach an aluminum bar to the tall cabinets (spaning 8') to attach the 3 poster frames. Each one weighs 13 lbs, so 50lbs would be the max load. I would like the 6 holes in the bar to be slotted if possible to make adjustment horizontally possible. I would need to know the width and thickness of the bar needed so no sag is experienced, but it is as invisible as possible.
Thank you for your help