Ambient air vaporizer is provided in arrays of finned tubes to provide vaporization rates up to 40,000 scfh per array. It treats the air as a heat source and changes the liquefied product such as oxygen, nitrogen and argon into gas. The temperature of the gas is in normal room temperature. It is used in periodical maintenance on heated vaporizer. It is also used in warm weather to save energy. It is used to convert the high-pressure LOX into GOX. The high pressure GOX system is used for operating pressure.