The US Low Seam CoalSAFE model is designed for underground coal mines with a minimum seam height of 46” (1.4m). The unit can be custom-designed to client specifications, but typically features 12, 16, 20 and 24 person configurations.

Due to the height restrictions of low seam operations, the Low Seam CoalSAFE features a secure, separately transportable External Cylinder Bay (ECB) to house the liquid CO2 cylinders required to power the refuge’s internal life support systems.

Through innovative design, the CoalSAFE is currently the only refuge model on the market to incorporate both a powerless carbon dioxide/carbon monoxide (CO2/CO) scrubber as well as an intrinsically safe air conditioning system (refrigerant R744). This standalone unit, dubbed the MARCis (MineARC Air Refuge Chamber - Intrinsically Safe), runs on liquid CO2, and is the first of its kind anywhere in the world.

The CoalSAFE is manufactured and tested to the highest industry regulations and guidelines: Approved by the West Virginian Office of Miners Health and Safety and currently the only refuge model in the world built to United States Mine Safety & Health Administration (MSHA) 'Final Rule' 2009 (30CFR §7.503).