- (a) Where oxygen is supplied by a constant-flow device only, the rate of flow shall be at least 3 liters per minute for the entire rated service time of the apparatus.
- (b) Where constant flow is used in conjunction with demand flow, the constant flow shall be greater than 1.5 liters per minute for the entire rated service time.
- (c) All demand-flow devices shall provide at least 30 liters of oxygen per minute when in the fully open position.