The Martech Services Co. Personal Air Breathing Unit, No. P-20, provides Grade D breathable air for a proper NIOSH-approved respirator, and with the provided 54" tool air hose assembly, it allows air bypass for a paint spray gun. This unit is a 20 SCFM system and works with the existing filter compressed air supply. The filter must provide air quality equal to that required for a flawless paint finish. The unit is a complete, belt-mounted system, with a built-in filter and a carbon monoxide monitor with both audible and visual alarms, continuously monitoring the air for compliance with current OSHA standards.