Is this installation legal?

User botlit asks if this photo of an installation is illegal or not? What do you think?

Answer: As long as the vent on the regulator meets the distance requirements to doors, windows, fresh air vents, sources of ignition, etc. it should be legal. Copper can be used as long as it’s flared – or sweated with material that has a melting point above 1,000°F.
– jst1265