Looks like 30 gauge galvanized which is only slightly better, I'm thinking the cardboard he said he used for going through the window is the biggest fire hazard. I can't take single wall vent pipe from a nateral gas furnace within 12" inches of anything combustible. No combustion air, flu running downhill, venting a foot from a window. Hard saying if fire or CO will do him in.
Anyone else tried to satelite view around the indy zoo looking for his spot with landmarks from his videos? I can't find it I don't think hes by the zoo but nothing else in indy make sense the way the rails run and you can see downtown something in the background occasionally in his videos.