Several methods and a system for a method and system of safeguarding a filling process of a breathable air apparatus are disclosed. In one embodiment, a method of safety of a building structure includes safeguarding a filling process of a breathable air apparatus by enclosing the breathable air apparatus in a secure chamber of a fill site of the emergency support system of the building structure to provide a safe placement to supply the breathable air to the breathable air apparatus. The method may include ensuring that a prescribed pressure of the emergency support system maintains within a threshold range of the prescribed pressure by including a valve of the emergency support system to prevent leakage of breathable air from the emergency support system.