What mode of air line respirator would be least appropriate to be supplied from tanks?

Continuous flow air line respirators deliver a constant supply of air, regardless of the user's breathing pattern. This design is generally less efficient for use with tanks because it continuously uses air, potentially depleting the tank's resources quickly without consideration for the user's actual air requirements at any given moment.

In contrast, other modes such as demand flow respirators provide air only when the user inhales, which is more efficient for saving the tank's air supply. Pressure demand respirators also optimize air usage by maintaining a positive pressure and only delivering air as required. Pipeline supply systems are designed for a constant flow of air from a centralized source, which is different in context from tank supply, but efficient in its own right.

Thus, when considering which method is least appropriate for supplied air from tanks, continuous flow emerges as the option that could result in faster depletion of air resources without adapting to the user’s needs.