Compliance with the OSHA requirement for Grade "D" Breathable Air can be accomplished with the use of a Quality Air Breathing System Model P-20, Personal Air Breathing Unit, from Martech Services Company. When used properly, a Personal Air Breathing Unit will work with the existing filtered compressed air supply and provide Grade "D" Breathable Air for a proper NIOSH approved respirator. With the provided 54-inch tool air hose assembly, it will allow for a bypass of air for a paint spray gun. The Personal Air Breathing Unit works with the existing filter compressed air supply. The existing filter must provide air quality equal to that required for a flawless paint finish.