And escutcheon is used to go around pipes and the like to cover the open holes around the pipes.
A canopy is used to protect the junction box the ceiling fan or light fixture is wired to.
I managed two lighting fixture showrooms, and designed and built custom light fixtures and repaired most every type available, including wiring old gas chandeliers and making them wired ones with lights, for about 13 years, back about 35 years ago.
And, no, the old gas chandeliers I wired up were not UL listed, but back then, no one really cared. That was then, not now. Back then, we did a lot of things which were "not right", but that was even before GFCI protection came in, so no one cared, in fact, no one even thought about the stuff as being "not right".
You have 60 or so 5-10 foot diameter gas lite chandeliers you want wired up for electric lights? Yeah, I could do that. I developed a trick for getting a very small wire through those very small gas lite arms. Remember, gas did not need a very large passageway, not like wires to.
You have a 20 foot diameter crystal chandelier and you want ... yeah, I could do that.
You have a couple of discos and you want custom floor and ceiling lighting systems ... yeah, I could do that too.
Been there, done that, had fun doing it.
BUT ... it would NOT pass muster today. Now we know that the Plexiglas® gives off toxic fumes when it burns and you are not allowed to use that. Did not matter back then, not until there were a few fires and it was discovered that the people were not dying from the fire, but from the toxic gas from the plastics. (And, no, none of the ones I designed and installed every had a fire or any other problem either. But some did, and we all learned from those.)
If I made today some of the stuff I made back then, I'd have to be shot ... that would be the only punishment suitable for someone doing it today.
