Section 25.1445 - Equipment standards for the oxygen distributing system(a) When oxygen is supplied to both crew and passengers, the distribution system must be designed for either- (1) A source of supply for the flight crew on duty and a separate source for the passengers and other crewmembers; or(2) A common source of supply with means to separately reserve the minimum supply required by the flight crew on duty.(b) Portable walk-around oxygen units of the continuous flow, diluter-demand, and straight demand kinds may be used to meet the crew or passenger breathing requirements.