“10” x 6″ fired clay, ~3lbs. mounting brackets on one side only, cavities run through the length of it."
Answer: “This is a heating element section for a kiln.”
The @$$ box is a reality in every hospitals break room. It serves for a lot of giggles. :)
..same for #13, #14, #15 and #16
An air diffuser? Oh thank god, that's really not what my first thought was and I was scared...