[olddog]

Undy, do not underestimate the dangers of nitrogen. It kills people every year. I think more than any other gas in industry. It is not the nitrogen that kills you. It is the absence of oxygen. I said one lung full and your dead. It takes about a half dozen breaths to replace what is in your lungs. Loss of conciseness occurs at about 3 breaths with little to no warning.

Don't use it in a closet obviously. Open areas with moving air are safe unless the volume is high. We have excess flow valves that shut the line if the flow exceeds a maximum. Regulator can fail and dump a bottle quickly.