Bullard CAB50SN Clean Air Box provides 3 stage air filtration & CO (carbon monoxide) monitoring to help satisfy OSHA Grade D Breathing Air requirements. Features Durable construction withstands harsh working environments Polycarbonate Pelican Case Auto condensate drains will extend the filter element lifespan CO Monitor Automatic calibration is approx. 90 seconds with no tools required High-intensity 90dB alarm, remote capable read more...