found a propane insert sitting on a piece of cardboard on the carpet up against a wall. it has been in operation this way for at least 8 years and the rest of the install looks correct according to the manual.
this unit was meant to be installed in a framework. clearances were 0", zero inches to combustibles except for 1/2" to back wall.
It had some other issues so I tagged it and shut off gas to it, but just wanted to know what others thought.