Operation of the Hip-Air Pressure Demand Breathing Apparatus is manual. It is an approved, rated five-minute escape device. The pressure demand air-line respirator phase is connected by an approved air-supply hose to a primary respirable air source; the worker breathes from this source with the valve of the egress (exit) cylinder of the device turned off until the user is ready to leave the working area. The user can leave, connected to the primary air source, or can open the egress cylinder valve and have approximately five minutes respiratory protection. When breathing from the air cylinder, the user can remain connected to the primary air supply and exit, or can disconnect from the air source for easier escape. If the primary air supply source should fail for any reason, the worker can switch to the egress cylinder by turning a valve and escape to a safe atmosphere.