A one-chair barbershop opened in a store inside a subway station near work some months ago.
The man has a wall mounted fan-forced air heater hanging from a bracket in the wall. You know the type - brown rectangular box with a louver...looks like a gas heater but there's no gas pipe.
It's hardwired to a stump of AC coming straight ouf of a hole in the wall, similar to what Joe has posted. The difference is there is no box.
The cable just comes straight out of the hole and is wired directly into the terminals of the heater.
Somehow I don't think this is kosher....