Hydrogen is highly flammable. Should be stored in areas, with ventilation using the right pressure equipment for safety reasons. It is crucial to have measures in place for leak detection and fire prevention as ensuring proper ventilation. The Hydrogen On Demand systems work uniquely by producing HHO gas when needed and the engine uses it away. Under no circumstances should you attempt to start a fire or ignite it without caution. Always stay aware of your actions. When in doubt seek advice, from experts before proceeding.