276000 - Miller BreatheAir 3-Stage Replacement Filter Kit for 4-Person Box

Technical Overview of the Miller BreatheAir™ Filter Kit

The Miller 276000 BreatheAir™ Filter Kit is a critical maintenance component designed for the Miller BreatheAir™ 4-person portable box and panel systems. This kit is engineered to ensure the delivery of Grade-D breathing air, strictly adhering to OSHA standards for industrial respiratory protection. The system utilizes a sophisticated three-stage filtration process to purify compressed air, making it safe for personnel in hazardous environments such as manufacturing, chemical processing, and heavy fabrication.

The filtration assembly is rated for a capacity of 123 CFM, sufficient to supply multiple users simultaneously without pressure drops that could compromise safety. The process begins with the first-stage filter (white), which effectively removes 95% of bulk liquids and larger particulates down to 5.0 microns. This pre-filtration step protects the finer downstream media from premature saturation. The second stage (red) is a high-efficiency coalescing filter capable of removing 99.99% of fine oil mists and microscopic particulates down to 0.01 microns, ensuring the air is free of mechanical contaminants.

The final stage involves an activated carbon filter (silver), specifically targeted at removing organic vapors, odors, and tastes that may be present in the compressed air supply. This stage is vital for user comfort and compliance with breathing air quality regulations. The kit includes all necessary O-rings to ensure a hermetic seal within the filter housing, preventing bypass leakage. Regular replacement of these filters is essential for the proper function of the system's CO monitor and to prevent contamination of the breathing air supply.