275983 - Miller BreatheAir Portable Box 2-Person Filtration System, 49 CFM, 10ppm Alarm

Industrial Grade-D Breathing Air Compliance

The Miller 275983 BreatheAir Portable Box is a critical component for industrial safety compliance, specifically designed to provide Grade-D breathing air to personnel in environments where air quality is compromised. This 2-person filtration system is engineered to interface with plant air supplies or mobile compressors, transforming standard compressed air into breathable air suitable for Supplied Air Respirators (SAR). By adhering to strict filtration standards, this unit ensures that workers are protected from particulates, oil mists, and organic vapors that are common in heavy manufacturing and fabrication settings.

At the core of the system is a high-efficiency three-stage filtration assembly. The first stage acts as a pre-filter, removing 95% of bulk liquids and particulates down to 5.0 microns. The second stage is a coalescing filter that eliminates 99.99% of fine oil mists and microscopic particulates down to 0.01 microns. Finally, the third stage utilizes activated charcoal to remove organic vapors, odors, and tastes, ensuring the air is not only safe but comfortable to breathe. This multi-layered approach guarantees compliance with OSHA standards for Grade-D breathing air when supplied with appropriate input pressure.

Safety monitoring is integral to the BreatheAir system. It features a built-in Carbon Monoxide (CO) monitor that continuously samples the airflow. If CO levels exceed 10 parts per million (ppm), the unit triggers both external warning lights and a loud audible alarm, allowing for immediate evacuation or corrective action. The monitor is designed for rapid calibration, taking less than two minutes, which minimizes downtime during setup. Additionally, the unit includes automatic condensation drains to extend filter life and filter change indicators to prevent maintenance oversight.

Constructed for the rigors of the job site, the portable box weighs only 23 pounds and is housed in a rugged case. It supports a flow rate of 49 CFM, sufficient for two operators using C50 SAR systems. The manifold is equipped with 1/2-inch industrial interchange quick disconnects for secure and universal compatibility. Note that this system does not remove Carbon Monoxide; it monitors it. Therefore, compressor intake placement is vital.