"S. Barker"
Dunno but he's either the same person or another who thinks there really is such a thing. Perhaps it's a marketing scam some folks buy into?
Now safety compliant, yes. How it's vented and such. The only 'EPA' relevance I can think of, have to do with what you burn, not what you burn it in. Dont use treated wood for example due to the chemicals which can be carginogenic when burning.