Supplied air respirators require a source of clean breathing air such as plant air systems, low pressure pumps, or bottled air. Complete systems include a supplied air hose, an air regulating valve, a breathing tube, and a helmet, hood, or other facepiece.Potential benefits include: A cost-effective way to provide a high level of respiratory protection 3Ms range of supplied air valves can cool or heat air by up to 50F (28C) No filters, cartridges, or batteries to maintain Supplied air provides no additional breathing resistance to the wearer