There are no legal or other regulations from the government bodies or elsewhere for decorative fireplaces that run on alcohol. The fireplaces qualify under burning candles category in legal fire regulations. Our products are laboratory tested and we have never been notified within the final report that in order for these products to be installed indoors one would have to (or that it would be advisable to) install any additional ventilation system. Nevertheless, Ethanol Fireplaces are to be used - above all - with common sense, so the flame should never be left unattended and the only ventilation you should have in the room with an ethanol-run fireplace is a window, which you can open if it gets too hot.
For more details, please refer to the following article: Regulations of Ethanol Fireplaces